AN EXTRA 9000 people a year will die from heat by the end of the century.
A leaked draft copy of the Intergovernmental Panel on Climate Change's second report has made the warning.
Nationally, an estimated 800,000 more people will also fall ill with stomach bugs every year from contaminated food and water and more than 270,000 homes will be at risk of collapsing into the ocean from rising sea levels.
The number of temperature-related hospital admissions in South Australia will increase by 110 per cent by the end of the century, while the number of people expected to die in NSW from extreme heat will triple
It also warns that $226 billion worth of coastal assets including homes, rail and road infrastructure are at risk with just a 1.1 metre rise in sea levels.
It reveals south eastern Australia is now a global climate change "hot spot" with the ocean warming faster than anywhere else on the planet and set to increase by 10 per cent more than the global average.
Under the high-emissions scenario, on which the report is based, an extra 9000 people a year will die from heat across Australia by the end of the century.
The report of the IPCC's Working Group II, due to be released next March in Yokohama, Japan, also singles out the NSW and Queensland Governments for revoking or downgrading planning rules which would help communities to adapt to changing conditions and prevent damage to infrastructure.
The report of working group I was released in Stockholm two weeks ago and contained much-awaited new data on the projected changes to the atmosphere.
It warned that the that global temperatures were on track to rise between 2C and 4C by 2100 without action to reduce greenhouse emissions - warming above 2C is considered dangerous and 4C considered catastrophic.
News Corp has obtained a secret draft report of the second working group of the IPCC.
The Working Group II AR5 report examines the extent of the impacts of climate change in different regions of the world.
The section on Australasia, co-authored by 45 scientists from Australia, NZ and the US, runs to more than 100 pages, and reveals what impacts these climate changes are expected to have on economies, industries, human health and ecosystems.
It will be the first update to the projections on what the world will be like under a changed climate since the last IPCC reports in 2007.
Under the high temperature case scenario "there would be an additional 8628 deaths a year by 2100".
Mean air temperature for Australia is predicted to increase by 0.5-1.5C by 2030 andby up to 2.5C-5C by 2070.
For the first time, damage to infrastructure has also been assessed.
"In Australia sea level rise of 1.1 metres would affect over $226 billion of assets including up to 274,000 residential and 8000 commercial buildings," the report said.
"While the magnitude of sea level rise during the 21st century remains uncertain, its persistence over many centuries implies that realisation of these risks is only a question of time.
"Projected increases in heatwaves will increase both heat-related deaths and hospitalisations, especially in the elderly, compounded by population growth and ageing.
"The number of hot days when physical labour in the sun becomes dangerous is also projected to increase substantially in Australia by 2070, leading to economic costs from lost productivity, increased hospitalisation and occasional deaths.
"While the magnitude of sea level rise during the 21st century remains uncertain, its persistence over many centuries implies that realisation of these risks is only a question of time."
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