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Image caption Melting permafrost in Alaska and other northern regions could unleash large amounts of warming gases from peatlands. The world's peatlands will become a large source of greenhouse gases as temperatures rise this century, say scientists. Right now, huge amounts of carbon are stored in boggy, often frozen regions stretching across northern parts of the world. But much of the permanently frozen land will thaw this century, say experts. This will release warming gases at a rate that could be 30-50% greater than previous estimates. Stretching across vast regions of the northern half of the world, peatlands play an important role in the global climate system. Over thousands of year... Full story

10 August