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The Intergovernmental Panel on Climate Change (IPCC) concluded in 2011 that countries must reduce global greenhouse gas emissions to 25 percent below 1990 levels to reach climate stabilization at 450 ppm, or 45 percent above 1990 emissions to reach 550 ppm. Stabilization at either 450 ppm or 550 ppm will be difficult to achieve and may still carry considerable risk of major climate events.