The dangers of nitrogen and phosphorous pollution and a proposed solution. Will you become a vegetarian too?
Singer Cadamole has two other ones:
http://www.youtube.com/watch?v=osWuWjbeO-Y&feature=relmfu
http://www.youtube.com/watch?v=oax3cUFsBSw&feature=relmfu
Hat tip to James Elser for this one!
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