Wildfire. Found at http://en.wikipedia.org/wiki/File:Boreal_pine_forest_after_fire.JPG
Abandoned crop field. Found at http://www.google.com/imgres?q=abandoned+crop+field&hl=en&sa=X&rlz=1C1AVSX_enUS413US413&biw=1680&bih=906&tbm=isch&prmd=ivns&tbnid=VsbIUCRNlMcvHM:&imgrefurl=http://www.flickr.com/photos/plant_diversity/page12/&docid=aPAt3diKJ8S7YM&w=500&h=375&ei=TpldTuz-Jqje4QSxv802&zoom=1&iact=hc&vpx=386&vpy=258&dur=1971&hovh=194&hovw=259&tx=149&ty=137&page=1&tbnh=134&tbnw=189&start=0&ndsp=39&ved=1t:429,r:9,s:0
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