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Modern society’s continued dependence on fossil fuels is warming the world at a pace that is unprecedented in the past 2,000 years — and its effects are already apparent as record droughts, wildfires and floods devastate communities worldwide — according to a landmark report from the United Nations on the state of climate science. The assessment from the UN’s Intergovernmental Panel on Climate Change (IPCC) says things are poised to get worse if greenhouse-gas emissions continue, and makes it clear that the future of the planet depends, in large part, on the choices that humanity makes today.