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Fossil Fuels Need to Stay Unburned to Meet Climate Target

Most known reserves of fossil fuels will need to stay unburned to stop temperatures rising beyond a United Nations target that seeks to curb climate-change dangers.

About 531 billion metric tons of carbon have been emitted by burning oil, coal and gas, cutting down forests and making cement since 1750, the UN said today. Capping greenhouse gas output at 840 billion tons gives a 50 percent chance of meeting the UN target of restraining warming below 2 degrees Celsius (3.6 degrees Fahrenheit), it said in its first such estimate.