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A team of environmental researchers in the US has warned many effects of
climate change are irreversible.
The scientists concluded global temperatures could remain high for 1,000 years,
even if carbon emissions can somehow be halted.
Their report was sponsored by the US Department of Energy and comes as
President Obama announces a review of vehicle emission standards.
It appears in the journal Proceedings of the National Academy of Sciences.
The scientists have been researching global warming and the consequences for
policymakers.
The team warned that, if carbon levels in the atmosphere continued to rise,
there would be less rainfall in already dry areas of southern Europe, North
America, parts of Africa and Australia.
The scientists say the oceans are currently slowing down global warming by
absorbing heat, but they will eventually release that heat back into the air.
They say politicians must now offset environmental damage already done by
man-made pollution.
"People have imagined that if we stopped emitting carbon dioxide the climate
would go back to normal in 100 years, 200 year - that's not true," said
researcher Susan Solomon, the lead author of the report, quoted by AP news
agency.
Their conclusions come as President Obama ordered the US Environmental
Protection Agency to review rules on carbon emissions from passenger vehicles.