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Greenhouse Effect: CO2 Concentrations Set to Hit Record High of 400 PPM - TIME
 The Guardian | Greenhouse Effect: CO2 Concentrations Set to Hit Record High of 400 PPM TIME What kind of global warming we'll see in the future will largely be due to how much carbon dioxide—and to a lesser extent, other greenhouse gases like methane—we add to the atmosphere. And to fully understand the future, we need to understand the ... What Is the Keeling Curve? Up, Up and Away! Scientists Anxious as CO2 Levels to Cross 400 PPM Carbon Dioxide Levels this High Pre-Date Humanity |