BBC News | SCI/TECH | Global warming 'worse than feared' Immediate action is needed to protect the Earth from dramatic climate change, a top United Nations scientist has warned.
Dr Robert Watson was speaking as an influential UN body formally published its third assessment on climate change.
The report says global temperatures are rising nearly twice as fast as previously thought.
Dr Watson, who chairs the IPCC (Intergovernmental Panel on Climate Change), dismissed President George W Bush's doubts about the reality of global warming.
"We know enough to say climate change is a serious environmental issue," said Dr Watson.