The US must balance science with what is politically and technologically achievable on climate change, America's lead negotiator has said.
Speaking at UN talks in Bonn, Jonathan Pershing said the US must not offer more than it could deliver by 2020.
Poor countries said the latest science showed rich states should cut emissions by 40% on 1990 levels by 2020.
President Barack Obama's plan merely to stabilise greenhouse gases at 1990 levels by 2020 is much less ambitious.
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