Uncertainty is growing over the future of the Kyoto Protocol, the first legally binding treaty to cut greenhouse gases blamed for heating up the planet.
Nearly 40 industrialised nations -- all except the United States -- are supposed to meet agreed emissions targets during the pact's 2008-12 first phase but some countries are way behind their targets and will likely miss them.
The disappointing outcome from December's climate talks in Copenhagen has cast a cloud over whether Kyoto will be extended for a second period from 2013, raising questions over the shape of a future legally binding climate pact that all nations can agree on.
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