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Turn down the heat: why a 4°C warmer world must be avoided

This report provides a snapshot of recent scientific literature and new analyses of likely impacts and risks that would be associated with a four degrees Celsius warming within this century. It outlines a range of risks, focusing on developing countries and especially the poor. The report shows that a four degrees Celsius world would be one of unprecedented heat waves, severe drought and major floods in many regions, with serious impacts on ecosystems and associated services. However, this can be avoided with greater mitigation and adaptation efforts. Thus the level of impacts that developing countries and the rest of the world experience will be a result of government, private sector and civil society decisions and choices, including inaction, the report underlines. It also points out that, given the uncertainty of the full nature and scale of impacts, there is no certainty that adaptation to a four degrees Celsius world is possible. Therefore, the projected warming must be prevented.