a) imagens:
tema: problemas ambientais
imagens
google:3.230.000 para problemas ambientais
http://www.google.pt/search?hl=pt-PT&source=hp&fkt=4696&fsdt=4696&q=+problemas+ambientais&meta=&rlz=1R2SKPB_pt-PTPT341&aq=null&oq=
videos
google:1 330 para problemas ambientais
http://video.google.pt/videosearch?hl=pt-PT&source=hp&fkt=4696&fsdt=4696&q=problemas%20ambientais&rlz=1R2SKPB_pt-PTPT341&um=1&ie=UTF-8&sa=N&tab=wv#
imagens
yahoo:5,550,000 results for problemas ambientais
http://search.yahoo.com/search?p=problemas+ambientais&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-701
videos
yahoo:4 for problemas ambientais
http://video.search.yahoo.com/search/video;_ylt=A0geurb.e_FKFksA0RBXNyoA?ei=UTF-8&p=problemas%20ambientais&fr2=tab-web&fr=yfp-t-701
