Limiting global warming to 1.5 degrees Celsius will avert runaway climate change but not mass suffering in developing countries, a consortium of 50 researchers warned on Wednesday. Some 200 million people in poorer regions will be exposed to unlivable heat and half a billion will face the devastating ravages of rising seas even if the world meets the more optimistic Paris target of 1.5C, they said in a major study. To avoid exposing large parts of humanity to "significant harm, a fair threshold should be set at or below 1C," the scientists said. The average surface temperature of the Earth has already risen by 1.2 °C. (Marlowa HOOD)

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