From Matt’s coverage on the final hours of COP15 in Copenhagen to the one year anniversary of the massive coal ash spill at TVA’s Kingston plant, called by the EPA as “one of the worst environmental disasters of its kind in history,” a lot happened this week in green. We rounded up the best and worst of 2009, including critically endangered species and the year in pee and poop (according to Sami), James

Cameron’s new science-fiction film, Avatar premiered this week with environmental themes, and a new report in the journal New Scientist found that a medium-sized dog pollutes more than cars. Find out what else happened in the world … Read the full story on TreeHugger

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The Week in Pictures: TVA Coal Ash Spill Anniversary, Avatar’s Environmental Theme, Best and Worst of 2009, and More (Slideshow)