Published in the journal Asia and the Pacific Policy Forum, Professor Corey Bradshaw (University of Adelaide) in collaboration with Professor Barry Brook (University of Tasmania), examined the relative contribution of different immigration policies to Australiaâ€™s future population size and emissions trajectory. Australiaâ€™s natural population growth is below replacement, so both its recent past and future increases in total population size result from net immigration.
The researchers investigated how much Australia needs to reduce its per capita emissions to achieve future emission reduction targets under six different immigration scenarios: zero net immigration; â€˜business-as-usualâ€™ net intake of 215,000 people/year; constant proportional immigration of 1% of the total population; total net intake of 20,000 and 100,000 a year; and doubling the net total immigration.
â€œAustralians are among the highest per capita greenhouse gas emitters on the planet, exuding a whopping 25-27 tonnes of greenhouse gases (carbon dioxide equivalents) per person per year,â€ says Professor Bradshaw, Sir Hubert Wilkins Chair of Climate Change at the University of Adelaideâ€™s Environment Institute. â€œBy way of comparison, the French emit 5.2 tonnes, the Chinese 6.7 tonnes, the Canadians 14.1 tonnes and the Americans 17.0 tonnes â€“ our emissions record is appalling.â€
The researchers looked at the current national targets of 5% reduction on year 2000 emissions by 2020, and 26-28% reduction on year 2005 emissions by 2030, as well as an earlier, no longer in place, target of 80% reduction on year 2000 emissions by 2050.
They found that achieving the 2030 target of 27% reduction (the median of 26-28%) would require a drop in per capita yearly emissions to between 12.5 and 17.4 tonnes by 2030, depending on the immigration scenario.
â€œWeâ€™ll need to achieve massive reductions in our per capita emissions, regardless of which immigration policy we follow,â€ says Professor Brook, Professor of Environmental Sustainability at the University of Tasmania.
â€œIf we maintain constant proportional net immigration of 1%, we would have roughly 10% more emissions by 2030 than if our population remained stable. To meet the 2030 target we would need to get down to 15 tonnes of emissions per person by 2030 and, even at zero net immigration, that figure would be 12.5 tonnes. Thatâ€™s under 14 years from now.
â€œWe need a rapid energy revolution if we want any chance of stemming emissions to meet our targets.â€
The 80% reduction by 2050 would require a drop to 3-5 tonnes emissions per person, equivalent to reducing per capita output by 6 to 10 times relative to todayâ€™s emissions.
â€œAustralia has no credible mechanisms in place to achieve these goals,â€ says Professor Bradshaw. â€œThat will require substantial policy changes across population, energy, agriculture and the environmental sectors.â€
Professor Corey Bradshaw, lead author, University of Adelaide. Phone: +61 8 8313 5842, Mobile: +61 (0) 400 697 665
Professor Barry Brook, co-author, University of Tasmania. Phone: +61 (03) 6226 2655, Mobile: +61 (0) 420 958 400
Robyn Mills, Media Officer. Phone: +61 8 8313 6341, Mobile: +61 (0)410 689 084, [email protected]
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