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by degree impacts world - dels.nas.edu

Warm ngworldimpacts by degree Based on the National Research Council report, Climate Stabilization Targets: Emissions, Concentrations, and impacts over Decades to Millennia (2011)1summary 3main findings 4the human impact on climate 8physical climate changesin the 21st century 16impacts in the next few decades and coming century 26using the science to inform choices 34231 Emissions of carbon dioxide from the burning of fossil fuels have ushered in a new epoch during which human activities will largely determine the evolution of the Earth s climate. 2 Because carbon dioxide is long-lived in the atmosphere, increases in this key gas can effectively lock the Earth and many future generations into a range of impacts , some of which could be severe. 3 Therefore, emission reduction choices made today matter in determining impacts that will be experienced not just over the next few decades, but also into the coming centuries and millennia. 4 Policy choices can be informed by recent advances in climate science that show the relationships among increasing carbon dioxide, global warming, related physical changes, and resulting impacts .

3 1 Emissions of carbon dioxide from the burning of fossil fuels have ushered in a new epoch during which human activities will largely determine the evolution of the Earth’s climate. 2 Because carbon dioxide is long-lived in the atmosphere, increases in this key gas can effectively lock the Earth and many

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