If we keep burning coal and petroleum to power our society, we’re cooked — and a lot faster than we thought. The United Nations scientific panel on climate change issued a terrifying new warning on Monday that continued emissions of greenhouse gases from power plants and vehicles will bring dire and irreversible changes by 2040, years earlier than previously forecast. The cost will be measured in trillions of dollars and in sweeping societal and environmental damage, including mass die-off of coral reefs and animal species, flooded coastlines, intensified droughts, food shortages, mass migrations and deeper poverty.
The worst impacts can be

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