Global warming ‘irreversible’

(BBC): 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.  Go to article