The Greenhouse Effect 

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In this video Paul Andersen explains how the greenhouse effect and greenhouse gases keep our planet warm enough to be habitable. He explains how greenhouse gases keep heat closer to the surface. He finally shows how increases in greenhouse gases may lead to dangerous global warming.
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Music Attribution
Title: String Theory
Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
balin, jean victor. Cartoon Cloud, December 2, 2009. [1]. commons.wikimed....
Dbc334. English: Molecule of Methane., October 24, 2006. Own work. commons.wikimed....
Duke, Eli. Tour of the Drilling Facility, December 1, 2012. Flickr: Antarctica: WAIS Divide Field Camp. commons.wikimed....
Edgar181. 3D Representation of Carbon Dioxide Created with ChemDraw., [object HTMLTableCellElement]. Edgar181. commons.wikimed....
File:GISP2 1855m Ice Core Layers.png, n.d. commons.wikimed....
"File:Top of Atmosphere.jpg." Wikipedia, the Free Encyclopedia, April 15, 2014. en.wikipedia.or....
"File:Trichlorofluoromethane-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed April 17, 2014. en.wikipedia.or....
Ito, Joi. English: "Ichigogari": Strawberry Greenhouse, February 16, 2008. originally posted to Flickr as Strawberry greenhouse. commons.wikimed....
mehmetaergun. Africa-Centered, "Upside-down" Earth, May 1, 2007. Own work. commons.wikimed....
Mills, Ben. Space-Filling Model of Nitrous Oxide, N2O, July 30, 2007. Own work. commons.wikimed....
---. Space-Filling Model of the Ozone Molecule, O3., May 27, 2009. Own work. commons.wikimed....
"The Greenhouse Effect." PhET. Accessed April 17, 2014. phet.colorado.e....
work, Own. English: Structure of the Water Molecule (H2O), August 2008. Based in part on the public domain image Image:H2O (water molecule).jpg by Solkoll. Corrected by Plenz. commons.wikimed....
---. English: Structure of the Water Molecule (H2O), August 2008. Based in part on the public domain image Image:H2O (water molecule).jpg by Solkoll. Corrected by Plenz. commons.wikimed....