http://inhabitat.com/wp-content/blogs.dir/1/files/2012/11/smokestack-sun-537x357.jpeg
Global warming
http://polardiscovery.whoi.edu/poles/images/emission_graph-lg.jpg
http://www.aoi.com.au/bcw/Greenzilla/PL03-greenhouse_effect.jpg
http://1.bp.blogspot.com/_pl_8mcVLvrg/SUfvB1EcINI/AAAAAAAAACM/MzwfHgnpIzY/s400/deforest+top.bmp
http://thumbs.dreamstime.com/thumblarge_492/1270510150o4N5J5.jpg
http://www.erinrsilva.com/wp-content/uploads/2011/05/6a00d8341bf7f753ef00e54f73de3b8833-800wi.jpg
http://wattsupwiththat.files.wordpress.com/2011/02/ocean_fertilization.jpg
http://planetsave.com/files/2009/02/human-global-warming.jpg