ENVIRONMENT | THE MUST-SEE DOCUMENTARY
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. Like Crash Course? http://www. FACEBOOK /YouTubeCrashCourse Follow Crash Course! http://www.#/TheCrashCourse T*mbl Crash Course: http://thecrashcourse.tumblr.com Table of Contents Ecosystem Services 00:51 The Importance of Biodiversity 04:07 … Read more