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Kerry warns of climate change 'catastrophe'

US Secretary of State John Kerry arrives to speak to the media at the US Ambassador to France's residence in Paris, on March 30, 2014, following his meeting with Russian Foreign Minister Sergey Lavrov about the situation in UkraineUS Secretary of State John Kerry has warned that failing to act immediately and decisively on climate change will have "catastrophic" and wide-ranging consequences. The top US diplomat was reacting to a UN expert panel report that said Monday soaring carbon emissions will amplify the risk of conflict, hunger, floods and migration this century.