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Supertopics:
Petroleum Substitute Ecological Problems
Biofuel Problems
Ecological Problems of Biofuel Production
Subtopics:
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