Earth has been both cooler and warmer in the past, but the change is usually gradual. The current rate of carbon dioxide increase is unprecedented in human history, and solutions to mitigate its effect on global warming are challenging to implement.Play Lecture
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242ExtinctionsBioInteractive provides free classroom resources on subjects ranging from evolution to human health to the workings of the biosphere. We are pleased to offer educators materials to help you use elements of the Smithsonian Channel's Mass Extinction: Life at the Brink program in your classes.