Global warming: http://www.youtube.com/watch?v=Z_jHP6xBLe8
The Greenhouse effect: http://www.youtube.com/watch?v=NFXR49hg8II
Sea levels: http://www.bbc.co.uk/learningzone/clips/evidence-for-global-warming-sea-level-change-no-narration/1496.html
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