Scientists from Australia's University of New South Wales and Purdue University in the United States found that rising temperatures in some places could mean humans would be unable to adapt or survive.

"It would begin to occur with global-mean warming of about seven degrees Celsius (13 Fahrenheit), calling the habitability of some regions into question," the researchers said in a paper.

"With 11-12 degrees Celsius warming, such regions would spread to encompass the majority of the human population as currently distributed."

Researcher Professor Steven Sherwood said there was no chance of the earth heating up to seven degrees this century, but there was a serious risk that the continued burning of fossil fuels could create the problem by 2300.

"There's something like a 50/50 chance of that over the long term," he said.

The study -- which examined climate change over a longer period than most other research -- looked at the "heat stress" produced by combining the impact of rising temperatures and increased humidity.

Sherwood said climate change research had been "short-sighted" not to probe the long-term consequences of the impact of greenhouse gases blamed for global warming.

"It needs to be looked at," he told AFP. "There's not much we can do about climate change over the next two decades but there's still a lot we can do about the longer term changes."

In a commentary on the paper, published in the US-based Proceedings of the National Academy of Sciences, Australian National University academics said climate change would not stop in 2100.

"And under realistic scenarios out to 2300, we may be faced with temperature increases of 12 degrees (Celsius) or even more," Professor Tony McMichael said.

"If this happens, our current worries about sea level rise, occasional heatwaves and bushfires, biodiversity loss and agricultural difficulties will pale into insignificance beside a major threat -- as much as half the currently inhabited globe may simply become too hot for people to live there."

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