US Secretary of State John Kerry on Thursday issued a stark warning about the mounting effects of climate change, from food shortages to devastating droughts, saying time was running out for real action. Kerry said the window for facing the challenge was "closing quickly" and warned of dire consequences if climate change skeptics are wrong about the future and nothing is done. "If they're wrong, catastrophe," Kerry said in Boston after visiting a wind-technology testing center with British Foreign Secretary Philip Hammond. "Life as you know it on Earth ends. Seven degrees increase Fahrenheit (4 degrees Celsius) and we can't sustain crops, water, and life under those circumstances."

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