Some rich countries are seeking new rules under the UN climate convention that campaigners say would allow them to gain credit for "business as usual".Russia, Australia, Canada and some EU countries are among the accused.
The rules relate to land-use change, which can either release or absorb carbon, depending mainly on whether forests are planted or chopped down.
Rich countries, apart from the US, could account for about 5% of their annual emissions through this loophole.
The US is not involved in these negotiations because the proposals fall under the Kyoto Protocol, of which it - alone among developed countries - is not a part.
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