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Supertopics:
Alternatives to Petroleum
Petroleum Substitute Ecological Problems
Subtopics:
Ecological Problems of Biofuel Production
Biofuel Uses Much Land, Displaces Food Crops
Biofuel Production Uses Lots of Water
Biofuel Production as Global Warming Cause
Deforestation for Biofuel Production
Biofuel Air Pollution
Biofuel Ecology Problems Miscellany