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climate change(4)
united states(3)
clean air act(2)
clean water act(2)
emissions trading(2)
endangered species act(2)
energy efficiency(2)
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aboriginal traditional knowledge (atk)(1)
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acts(1)
acts of god(1)
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alpine ecosystems(1)
alternative energy(1)
american recovery and reinvestment act (arra)(1)
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