Why existing climate pledges won't cut it

With the current round of Kyoto Protocol commitments set to expire at the end of next year, here's a look at existing emissions reduction pledges, which scientists say will fail to limit global warming to safe levels.

LONDON (Reuters) - Scientists say existing pledges to cut greenhouse gas emissions by 2020 are too weak to stem dangerous climate changes including more droughts, floods and rising seas.       

They say the existing pledges will fail to limit global warming to 2 degrees Celsius, a commonly used safety threshold for dangerous change.        

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