5 HUMAN IMPACTS ON THE ENVIRONMENT - CRASH COURSE VIDEO: Hank gives the run down on the top five ways humans are negatively impacting the environment and having detrimental effects on the valuable ecosystem services which a healthy biosphere provides. 10:38 minutes

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Crash Course is a series of educational videos by John Green on Youtube. Includes U.S. History, Chemistry, World History, Biology, Literature, and Ecology.

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Crash Course is a Youtube channel providing lessons on Chinese history, communism, the silk road and more.

From Science to Social Studies, Crash Course offers it all in quick-paced, imaginitive videos aimed at learners of all ages. Explore the amazing collection here, with new resources and courses added constantly to broaden the reaches of the Crash Course experience.

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