Carbon Emission

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Buildings in Australia account for over 50% of electricity use and almost a quarter of our carbon emissions but the failures, frailties and fragmentation of the construction sector have created a major obstacle to long-term reductions. 
Reducing our carbon footprint plays second fiddle to the multibillion-dollar work of replacing flammable cladding, asbestos and other non-compliant materials and ensuring buildings are structurally sound and can be safely occupied.
Buildings – whether residential, commercial or institutional – do not score well under the nation’s main emissions reduction program, the A$3.5 billion <a href="https://www.environment.gov.au/climate-change/climate-solutions-package" target="_blank">Climate Solutions Package</a>. This is intended to help meet Australia’s 2030 Paris Agreement commitment to cut emissions by 26–28% from 2005 levels.
This climate fund has very successfully generated offsets under the vegetation and waste methods – these projects account for <a href="https://www.afr.com/companies/energy/climate-solutions-fund-aims-to-way-exceed-paris-targets-20191107-p5389w" target="_blank">97% of Australian carbon credit units</a> issued. But <a href="https://www.hvacrnews.com.au/news/buildings-to-the-rescue-for-erf/" target="_blank">built environment abatements have been very disappointing</a>.
Australians have <a href="http://climatecollege.unimelb.edu.au/facts4paris-australias-capita-emissions-remain-highest-among-its-key-trading-partners" target="_blank">very high emissions per person</a>. That’s partly due to how we use our buildings.
Our states and territories control building regulations. This year the Council of Australian Governments (COAG) <a href="http://coagenergycouncil.gov.au/publications/trajectory-low-energy-buildings" target="_blank">set ambitious energy-reduction trajectories</a> for buildings out to 2022 and beyond. This was to be achieved through amendments to national codes and implementing energy-efficiency programs.
<h2>Making the best use of our buildings</h2>
Last month, the Green Building Council and Property Council launched a policy toolkit, called <a href="https://new.gbca.org.au/news/gbca-news/making-every-building-count-industrys-practical-plan-lower-emissions-and-deliver-practical-savi/" target="_blank">Making Every Building Count</a>. The councils urged governments to adopt practical plans to reduce emissions in the building sector.
The toolkit contains no fewer than 75 recommendations for all tiers of government. These are the result of work done through industry and university research partnerships in places like the <a href="http://www.lowcarbonlivingcrc.com.au/" target="_blank">Low Carbon Living Collaborative Research Centre</a> – now disbanded after its seven-year funding ended.
Most energy-efficiency studies and programs focus solely on the operational aspect of buildings, such as the energy used to heat and cool them. However, various studies have proved that the energy and emissions required to manufacture building products, even <a href="https://theconversation.com/pink-batts-not-a-scandal-but-not-as-good-as-claimed-10213" target="_blank">energy-saving products such as insulation</a>, can be just as significant.
A more holistic approach is to look at the embodied energy already in our building stock, which then poses a <a href="https://www.adelaidereview.com.au/form/2019/06/25/book-extract-the-impact-of-overbuilding-on-people-and-the-planet/" target="_blank">serious question about our consumption</a>. So, besides aspirational codes for net zero-energy buildings, we should be asking: can we meet our needs with fewer new buildings?
In Melbourne, for example, an estimated <a href="https://www.sbs.com.au/news/the-feed/melbourne-s-60-000-vacant-houses-uncovered" target="_blank">60,000 homes are sitting unused</a>. Commercial property has very high vacancy rates – <a href="https://www.afr.com/property/commercial/retail-woes-blow-through-iconic-melbourne-strips-20190813-p52gi9" target="_blank">up to one in six premises are unoccupied</a> in parts of the city. This points to a less-than-effective market in valuing our embodied carbon emissions in property.
If we are to get serious about reducing emissions, we need to tackle inefficient space use.
<h2>Empowering people to cut emissions</h2>
In occupied commercial buildings, some evidence suggests most building managers are grappling with complexity and challenging tenant behaviours. They also don’t get the clear information they need to continually <a href="https://tfespecialreports.com.au/energy-efficiencys-big-secret-a-major-retrofit-of-performance-can-be-surprisingly-affordable/" target="_blank">improve their building’s performance beyond a selected benchmark</a>.
In residential property, home energy performance is very much in our own hands. So we need to consider the means, motivations and opportunities of households, which I did in my <a href="https://www.propertyobserver.com.au/https://minerva-access.unimelb.edu.au/handle/11343/220478" target="_blank">doctoral study</a>. A major barrier is that most of us don’t even know what we are getting when we buy or rent an ageing stock of more than 9 million homes.
Europe and the United States moved to <a href="https://www.gov.uk/buy-sell-your-home/energy-performance-certificates" target="_blank">mandatory residential energy disclosure</a> at point of sale and lease well over a decade ago. If you rent or buy a home in these countries you get an energy performance certificate. It identifies emissions intensity and gives advice on how to operate the home more efficiently and hence with lower emissions.
In Australia, we have just sat on a commitment made by <a href="https://www.coag.gov.au/sites/default/files/communique/2009-04-30.pdf" target="_blank">COAG back in 2009</a> to introduce a nationwide scheme.
Size matters, too. Residential space per person is <a href="https://www.commsec.com.au/content/dam/EN/ResearchNews/2018Reports/November/ECO_Insights_191118_CommSec-Home-Size.pdf" target="_blank">high by international standards</a>. Although McMansions are on the wane, our <a href="https://www.afr.com/property/residential/mcmansions-no-more-as-house-sizes-shrink-20191108-p538oi" target="_blank">apartments are getting a bit bigger</a>. The average size of freestanding houses built in 2018-19 shrank by 1.3% from 2017-18 to a <a href="https://www.commbank.com.au/guidance/newsroom/commsec-home-size-trends-report-201911" target="_blank">17-year low of 228.8 square metres</a>.
And we are putting more solar on our roofs as a carbon offset. As of September 30 2019, Australia had more than <a href="https://pv-map.apvi.org.au/analyses" target="_blank">2.2 million</a> <a href="https://theconversation.com/explainer-what-is-photovoltaic-solar-energy-12924" target="_blank">solar photovoltaic</a> (PV) installations. Their combined capacity was over 13.9 gigawatts.
However, the trend towards high-rise living is not helpful for emissions. <a href="https://www.solarchoice.net.au/blog/solar-for-strata-apartment-blocks/" target="_blank">Solar for strata apartments is tricky</a>.
I recently worked with colleagues in Australia and overseas in a <a href="https://link.springer.com/chapter/10.1007%2F978-3-030-04293-6_40" target="_blank">study</a> of the user experience of PV. We found residents face a range of issues that limit emission reductions. These issues include:
<ul>
<li>initial sizing and commissioning with component failures such as faulty inverters</li>
<li>lack of knowledge about solar and expected generation performance</li>
<li>regulatory barriers that limit the opportunity to upgrade system size.</li>
</ul>
Looking to improve regulations and codes and billion-dollar funds may be sensible ways to meet emission targets, but human empowerment is the secret weapon in improving energy performance and lowering emissions. Good low-carbon citizens will help create good low-carbon cities.
A set of clear guides on how to use a building is a good starting point. The <a href="http://builtbetter.org/lowcarbonguides/" target="_blank">low-carbon living knowledge hub</a> provides these.
What will make every building count in lowering emissions is the behaviour of occupants, the commitment of owners to make their buildings low-carbon and building managers’ ability to become more adept at reducing building-related emissions.<img src="https://counter.theconversation.com/content/126930/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;">
<a href="https://theconversation.com/profiles/timothy-oleary-685735" target="_blank">Timothy O'Leary</a>, Lecturer in Construction and Property, <a href="http://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a>
This article is republished from <a href="http://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/making-every-building-count-in-meeting-australias-emission-targets-126930" target="_blank">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

Making every building count in meeting Australia’s emission targets

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GUEST OBSERVATION
Concrete is the most widely used man-made material, commonly used in buildings, roads, bridges and industrial plants. But producing the Portland cement needed to make concrete accounts for 5-8% of all global greenhouse emissions.
There is a more environmentally friendly cement known as MOC (magnesium oxychloride cement), but its poor water resistance has limited its use – until now. We have developed a water-resistant MOC, a “green” cement that could go a long way to cutting the construction industry’s emissions and <a href="https://gccassociation.org/sustainability-innovation/" target="_blank">making it more sustainable</a>.
Producing a tonne of conventional cement in Australia emits about <a href="https://www.researchgate.net/publication/267233444_SCM's_potential_to_lower_Australia's_greenhouse_gas_emissions_profile" target="_blank">0.82 tonnes of carbon dioxide</a> (CO₂). Because most of the CO₂ is released as a result of the chemical reaction that produces cement, <a href="https://www.carbonbrief.org/qa-why-cement-emissions-matter-for-climate-change" target="_blank">emissions aren’t easily reduced</a>. In contrast, MOC is a different form of cement that is carbon-neutral.
<a href="https://images.theconversation.com/files/301205/original/file-20191112-178520-1o0tfjn.PNG?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301205/original/file-20191112-178520-1o0tfjn.PNG?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a>
Global CO₂ emissions from rising cement production over the past century (with 95% confidence interval). <a href="https://www.earth-syst-sci-data.net/10/195/2018/" target="_blank">Source: Global CO2 emissions from cement production, Andrew R. (2018)</a>, <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">CC BY</a>
What exactly is MOC?
MOC is produced by mixing two main ingredients, magnesium oxide (MgO) powder and a concentrated solution of magnesium chloride (MgCl₂). These are byproducts from magnesium mining.
<a href="https://images.theconversation.com/files/301216/original/file-20191112-178498-1i9iftz.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301216/original/file-20191112-178498-1i9iftz.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a>
Magnesium oxide (MgO) powder (left) and a solution of magnesium chloride (MgCl₂) are mixed to produce magnesium oxychloride cement (MOC). Author provided
Many countries, including China and Australia, have plenty of magnesite resources, as well as seawater, from which both MgO and MgCl₂ could be obtained.
Furthermore, <a href="https://pubs.acs.org/doi/pdf/10.1021/acs.chemrev.5b00463" target="_blank">MgO can absorb CO₂ from the atmosphere</a>. This makes MOC a truly green, carbon-neutral cement.
MOC also has many superior material properties compared to conventional cement.
Compressive strength (capacity to resist compression) is the most important material property for cementitious construction materials such as cement. MOC has a much higher compressive strength than conventional cement and this impressive strength can be achieved very fast. The fast setting of MOC and early strength gain are very advantageous for construction.
Although MOC has plenty of merits, it has until now had poor water resistance. Prolonged contact with water or moisture severely degrades its strength. This <a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/suco.201800077" target="_blank">critical weakness has restricted its use</a> to indoor applications such as floor tiles, decoration panels, sound and thermal insulation boards.
How was water-resistance developed?
A team of researchers, led by Yixia (Sarah) Zhang, has been working to develop a water-resistant MOC since 2017 (when she was at UNSW Canberra).
<a href="https://images.theconversation.com/files/301217/original/file-20191112-178494-1jalea4.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301217/original/file-20191112-178494-1jalea4.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip" alt=""></a>
Adding industrial byproducts fly ash (above) and silica fume (below) improves the water resistance of MOC. Author provided
<a href="https://images.theconversation.com/files/301393/original/file-20191112-178511-1he0duz.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301393/original/file-20191112-178511-1he0duz.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip" alt=""></a>
To improve water resistance, the team added industrial byproducts such as fly ash and silica fume to the MOC, as well as chemical additives.
Fly ash is a byproduct from the coal industry – there’s plenty of it in Australia. Adding fly ash significantly improved the water resistance of MOC. Flexural strength (capacity to resist bending) was fully retained after soaking in water for 28 days.
To further retain the compressive strength under water attack, the team added silica fume. Silica fume is a byproduct from producing silicon metal or ferrosilicon alloys. When fly ash and silica fume were combined with MOC paste (15% of each additive), full compressive strength was retained in water for 28 days.
Both the fly ash and silica fume have a similar effect of filling the pore structure in MOC, making the cement denser. The reactions with the MOC matrix form a gel-like phase, which contributes to water repellence. The extremely fine particles, large surface area and high reactive silica (SiO₂) content of silica fume make it an effective binding substance known as a <a href="https://concretecountertopinstitute.com/free-training/the-use-of-pozzolans-in-concrete/" target="_blank">pozzolan</a>. This helps give the concrete high strength and durability.
<a href="https://images.theconversation.com/files/301218/original/file-20191112-178498-1kb1a8v.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301218/original/file-20191112-178498-1kb1a8v.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a>
Scanning electron microscope images of MOC showing the needle-like phases of the binding mechanism. Author provided
Although the MOC developed so far had excellent resistance to water at room temperature, it weakened fast when soaked in warm water. The team worked to overcome this by using inorganic and organic chemical additives. Adding phosphoric acid and soluble phosphates greatly improved warm water resistance.
<a href="https://images.theconversation.com/files/301219/original/file-20191112-178516-1qpuacx.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/301219/original/file-20191112-178516-1qpuacx.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip" alt=""></a>
Examples of building products made using MOC. Author provided
Over three years, the team has made a breakthrough in developing MOC as a green cement. The strength of concrete is rated using megapascals (<a href="https://www.hunker.com/12304046/definition-of-concrete-mpa" target="_blank">MPa</a>). The MOC achieved a compressive strength of 110 MPa and flexural strength of 17 MPa. These values are a few times <a href="https://infostore.saiglobal.com/preview/is/en/2011/i.s.en197-1-2011.pdf?sku=1492629" target="_blank">greater than those of conventional cement</a>.
The MOC can fully retain these strengths after being soaked in water for 28 days at room temperatures. Even in hot water (60˚C), the MOC can retain up to 90% of its compressive and flexural strength after 28 days. The values remain as high as 100 MPa and 15 MPa respectively – still much greater than for conventional cement.
Will MOC replace conventional cement?
So could MOC replace conventional cement some day? It seems very promising. More research is needed to demonstrate the practicability of uses of this green and high-performance cement in, for example, concrete.
When concrete is the main structural component, steel reinforcement has to be used. Corrosion of steel in MOC is a critical issue and a big hurdle to jump. The research team has already started to work on this issue.
If this problem can be solved, MOC can be a game-changer for the construction industry.
Yixia (Sarah) Zhang, Associate Professor of Engineering, Western Sydney University. 
Khin Soe, Research Associate, School of Computing, Engineering and Mathematics, Western Sydney University.
Yingying Guo, PhD Candidate, School of Engineering and Information Technology, UNSW.
This article is republished from <a href="http://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/green-cement-a-step-closer-to-being-a-game-changer-for-construction-emissions-126033" target="_blank">original article</a>.
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Green cement a step closer to being a game-changer for construction emissions

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GUEST OBSERVATION
Political debate about a “big Australia” has re-emerged in response to <a href="https://theconversation.com/factcheck-is-australias-population-the-highest-growing-in-the-world-96523" target="_blank">high levels of immigration</a>, increasing congestion and high property prices in Sydney and Melbourne, where <a href="https://www.theaustralian.com.au/national-affairs/immigration/90pc-of-migrants-settling-in-two-cities/news-story/8746797d36bf40f41587d267e8dcdbc4" target="_blank">90% of migrants settle</a>. In 2010, <a href="https://www.aph.gov.au/About_Parliament/Parliamentary_Departments/Parliamentary_Library/pubs/rp/rp1617/Quick_Guides/MigrationStatistics" target="_blank">China overtook the United Kingdom as Australia’s largest source of permanent migrants</a> (a position <a href="https://www.homeaffairs.gov.au/about/reports-publications/research-statistics/statistics/live-in-australia/migration-programme" target="_blank">now held by India</a>). Since then, China-born migrants have <a href="https://www.homeaffairs.gov.au/about/reports-publications/research-statistics/statistics/live-in-australia/migration-programme" target="_blank">averaged around 15% of the annual intake</a>. That’s a significant contributor to the “Asianisation” of Sydney and Melbourne that <a href="https://books.google.com.au/books?redir_esc=y&amp;id=Yw-QVvwebDsC&amp;q=Peter+McDonald#v=onepage&amp;q=Demographic%20Transitions&amp;f=false" target="_blank">Peter McDonald pointed to a decade ago</a>.
In this context, <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/1745-5871.12316" target="_blank">our research</a> focused on the much-neglected dimension of the <a href="https://www.macrobusiness.com.au/2018/08/professor-ian-lowe-mass-immigration-mass-environment-killer/" target="_blank">environmental impact on cities</a> of population and immigration. Australian cities are world-leading – in the worst sense – in terms of the size of their <a href="https://www.footprintnetwork.org/our-work/ecological-footprint/" target="_blank">ecological footprints</a>, a measure of <a href="https://www.sciencedirect.com/science/article/pii/S1877705817316685?via%3Dihub" target="_blank">their resource use and greenhouse gas emissions</a>. And we found China-born residents more than triple their average levels of consumption compared to when they lived in China, even surpassing Australia-born residents’ consumption.
What did the study find?
We were interested in understanding the urban consumption behaviour of China-born 21st-century migrants (as measured by their ecological footprint) when they settled in Box Hill. This is a middle-class middle-ring suburb of Melbourne with the <a href="https://www.theage.com.au/national/victoria/this-map-shows-where-migrants-from-around-the-world-have-settled-in-melbourne-20170822-gy1dqh" target="_blank">greatest concentration of China-born residents</a>. We compared their consumption to their pre-migration footprint (when living in China) and to that of Australia-born residents in the same suburb.
Our findings are based on an extensive face-to-face survey of 61 China-born and 72 Australia-born residents. The main findings were as follows.
Within a decade of arrival in Melbourne, China-born urban consumption patterns were more than three times their consumption before their migration. They even surpassed the consumption levels of other residents of the suburb. Their housing consumption was 5.4 times higher than when in China, food consumption 4.7 times higher and carbon footprint 2.7 times bigger.
In part this is due to higher incomes, settling in a city with housing sizes and costs among the highest in the world and where the private car is the dominant form of transport. But cultural influences are also in play.
<a href="https://images.theconversation.com/files/243129/original/file-20181031-76416-1yk5cwu.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/243129/original/file-20181031-76416-1yk5cwu.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip" alt=""></a>
Figure 1. The gap in the CALD Index between residents born in China and in Australia suggests a strong cultural influence on consumption behaviours. (Click to enlarge.) <a class="source" href="https://onlinelibrary.wiley.com/doi/full/10.1111/1745-5871.12316" target="_blank">Ting, Newton &amp; Stone (2018)</a>, Author provided
It is apparent that consumer acculturation is the major process by which Chinese migrants have come to mirror the host society in Australia. Cultural integration is less evident – it lags consumer acculturation. This was clear from a comparison of scores on a Cultural and Linguistic Difference (CALD) Index.
The index incorporated measures of birthplace, English proficiency, religion, food preferences, participation in entertainment and festivals, avenues of social interaction and engagement with neighbourhood communities. The gap between the China-born and Australia-born groups’ scores on the CALD Index was significant (see Figure 1). This suggests a strong cultural influence on the China-born group’s urban consumption behaviours is likely.
<a href="https://images.theconversation.com/files/243131/original/file-20181031-76408-6migwa.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/243131/original/file-20181031-76408-6migwa.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=237&amp;fit=clip" alt=""></a>
Figure 2. China-born residents in Melbourne tend to have much larger housing in all categories than they had in China. (Click to enlarge.) <a class="source" href="https://onlinelibrary.wiley.com/doi/full/10.1111/1745-5871.12316" target="_blank">Ting, Newton &amp; Stone (2018)</a>, Author provided
A comparison of the different components of the ecological footprints of China-born and Australia-born residents was also revealing. Housing footprints measuring the size and type of dwelling occupied by the China-born residents were 18% larger overall.
This may be due to the role housing plays in reflecting an attained status (mien-tzu, or “to save face”) within the host society. Consumption levels that outstrip those of Australia-born residents indicate the potential danger of housing consumption being used to indicate “successful” settlement in Australia.
Food footprints of the China-born were 16% larger than the Australia-born. This reflected higher consumption of meat and dairy products and lower consumption of home-grown vegetables.
Carbon footprints of the China-born were 37% bigger, mainly as a result of more frequent overseas travel.
A rising burden on the planet
The global implications of these findings are potentially huge. The <a href="https://www.michaelwest.com.au/ross-garnaut-the-future-of-chinese-economic-growth/" target="_blank">rise of incomes among China’s population into the range of those in developed countries</a> can be expected to unleash new levels of urban consumption as this population aspires to the urban liveability enjoyed by people in Australia and North America. In these countries, however, city liveability ratings are closely related to <a href="https://www.sciencedirect.com/science/article/pii/S1877705817316685" target="_blank">ecological footprints that are almost triple those of China</a>.
Based on the rate of growth of the mainland Chinese middle class and the increase in consumption by the China-born middle class now living in Australia, the ecological footprint of China’s population of 1.4 billion can be expected to more than double over the next 10 to 20 years. This has significant consequences for planetary ecosystems and geopolitics.<img src="https://counter.theconversation.com/content/103921/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;">
Peter Newton, Research Professor in Sustainable Urbanism, Centre for Urban Transitions, Swinburne University of Technology
Christina Ting, Postdoctoral Research Fellow, Swinburne Business School, Swinburne University of Technology
Wendy Stone, Associate Professor, Centre for Urban Transitions, Swinburne University of Technology
This article is republished from <a href="http://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/chinese-migrants-follow-and-add-to-australian-city-dwellers-giant-ecological-footprints-103921" target="_blank">original article</a>.
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Chinese migrants follow and add to Australian city dwellers’ giant ecological footprints

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GUEST OBSERVATION
The carbon footprint of tourism is about four times larger than previously thought, according to a world-first study published today in Nature Climate Change.
Researchers from the University of Sydney, University of Queensland and National Cheng Kung University – including ourselves – worked together to assess the entire supply chain of tourism. This includes transportation, accommodation, food and beverages, souvenirs, clothing, cosmetics and other goods.
Put together, global tourism produces about 8% of global greenhouse gas emissions, much more than previous estimates.
Adding it all up
Tourism is a trillion-dollar industry, and is growing faster than international trade.
To determine the true emissions produced by tourism, we scanned over a billion supply chains of a range of commodities consumed by tourists. By combining a detailed international trade database with accounts tracking what goods and services tourists bought, we identified carbon flows between 160 countries from 2009 to 2013.
Our results show that tourism-related emissions increased by around 15% over that period, from 3.9 gigatonnes (Gt) of carbon-dioxide equivalent (CO₂-e) to 4.5Gt. This rise primarily came from tourist spending on transport, shopping and food.
<img src="https://images.theconversation.com/files/217900/original/file-20180507-166903-1irt6n0.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">
World map showing bilateral embodied carbon movements. In 2013, international travel was responsible for 23% of the global carbon footprint of tourism. [The carbon footprint of global tourism] 
We estimate that our growing appetite for travel and a business-as-usual scenario would increase carbon emissions from global tourism to about 6.5Gt by 2025. This increase is largely driven by rising incomes, making tourism highly income-elastic and carbon-intensive.
Whose responsibility is it?
In the study, we compared two perspectives for allocating responsibility for these emissions: residence-based accounting and destination-based accounting. The former perspective allocates emissions to the country of residence of tourists, the latter to the country of destination. Put simply, are tourism-related carbon emissions the responsibility of travellers or tourist destinations?
If responsibility lies with the travellers, then we should identify the countries that send the most tourists out into the world, and find ways to reduce the carbon footprint of their travel.
On the other hand, destination-based accounting can offer insights into tourism spots (like popular islands) that would benefit most from technology improvements and regulations for reducing the carbon footprint of tourism.
Tracking emissions under destination-based accounting over a specific period could help researchers and policymakers to answer questions about the success of incentive schemes and regulations, and to assess the speed of decarbonisation of tourism-related sectors.
So how do countries rank under the two accounting perspectives? The United States is responsible for the majority of tourism-related emissions under both perspectives – many people travel both from and to the US – followed by China, Germany and India.
But on a per-capita basis, the situation looks rather different. Small island destinations have the highest per-capita destination-based footprints. Maldives tops the list – 95% of the island’s tourism-related emissions come from international visitors.
Tourists are responsible for 30-80% of the national emissions of island economies. These findings bring up the question of the impact of tourism on small island states.
Islands as tourist destinations
Small islands depend on income from tourists. At the same time, these very tourists threaten the native biodiversity of the islands.
Small island states typically do not have the capacity to embrace technology improvements due to their small economies of scale and isolated locations.
<img src="https://images.theconversation.com/files/217909/original/file-20180507-166903-2md88e.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="">
Sustainable tourism on islands. Author provided
Can we lend a helping hand? Directing financial and technical support to these islands could potentially help with efforts to decarbonise their infrastructure. This support would be a reflection of the share of consumer responsibility, especially from developed nations that are “net travellers”.
Maldives, Mauritius and other small islands are actively exploring ways of building their renewable energy capacity to reduce the carbon intensity of local hotels, transport and recreational spots.
Creating awareness at multiple levels
We hope that our study provides a starting point for conversations between the public, companies and policymakers about sustainable tourism.
<img src="https://counter.theconversation.com/content/96200/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1">Ultimately real change will come from implementing regulations and incentives together to encourage low-carbon operations. At a personal level, though, it’s worth looking at the carbon-cost of your flights, choosing to offset your emissions where possible and supporting tourism companies that aim to operate sustainably.
Dr Arunima Malik, Lecturer in Sustainability, University of Sydney
Dr Ya-Yen Sun, Senior Lecturer, The University of Queensland
This article was originally published on <a href="http://theconversation.com" target="_blank">The Conversation</a>. Read the <a href="https://theconversation.com/the-carbon-footprint-of-tourism-revealed-its-bigger-than-we-thought-96200" target="_blank">original article</a>.
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The carbon footprint of tourism revealed (it's bigger than we thought)

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Leading office-products supplier COS has invested $1 million in installing over 1,500 solar panels at its facilities as it works towards zero carbon emissions.
The decision to invest in the panels came after an audit showed electricity to be contributing almost 50 per cent to the company’s carbon emissions.
COS’ solar energy farms in Sydney, Melbourne and Brisbane are expected to produce 80 per cent of power usage at each site. The panels at its Sydney facility alone covers over 6,060 square metres. 
These three sites will produce more than 611 megawatt hours per annum and reduce COS’ carbon emissions by 532 tonnes per year – equivalent to removing 133 cars off the road and growing 3,191 mature trees — according to a media release.
COS managing director Dominique Lyone said the company being privately owned means it has the freedom to make long-term decisions that may not have an immediate return on investment. 
“This move reflects our commitment to embracing new technology to protect natural resources and create sustainable solutions that benefit current and future generations. We hope this inspires other organisations to reduce their carbon footprint,” he added
COS worked with solar energy equipment supplier Sun Connect to install the solar panels at each site.
Sun Connect CEO Mark Tuke said the COS project was one of the largest commercial solar panel installations Sun had undertaken.
The COS website will also feature live data showing the amount of energy generated from its solar energy farms. 
“The solar energy farms actually produce more energy than we need with 25 per cent being fed back into the electricity grid. The next phase of this project will involve further investigation into battery storage solutions to move us closer to our goal of a zero emissions future,” said Lyone.
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