Hank gives the rundown 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. Table of Contents Ecosystem Services 00:51 The Importance of Biodiversity 04:07 Deforestation 06:42 Desertification 06:49 Global Warming 07:59 Invasive Species 08:51 Overharvesting 09:20 Crash Course/SciShow videos referenced in this episode: Hydrologic and Carbon Cycles: http://www.youtube.com/watch?v=2D7hZpIYlCA Nitrogen and Phosphorus Cycles: http://www.youtube.com/watch?v=leHy-Y_8nRs Ecological Succession: http://www.youtube.com/watch?v=jZKIHe2LDP8 Climate Change: http://www.youtube.com/watch?v=M2Jxs7lR8ZI Invasive Species: http://www.youtube.com/watch?v=eDOwTXobJ3k Food Shortage: http://www.youtube.com/watch?v=bPLJP84xL9A References: http://www.fs.fed.us/ecosystemservices/About_ES/index.shtml http://www.endangeredspeciesinternational.org/overview5.html http://www.epa.gov/acidrain/effects/surface_water.html Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids