Global warming is "unequivocal" and carbon dioxide already in the atmosphere commits the world to an eventual rise in sea levels of up to 4.6 feet, the world's top climate experts warned Saturday in their most authoritative report to date.
"Only urgent, global action will do," said U.N. Secretary-General Ban Ki-moon, calling on the United States and China _ the world's two biggest polluters _ to do more to slow global climate change.
"I look forward to seeing the U.S. and China playing a more constructive role," Ban told reporters. "Both countries can lead in their own way."
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