In Qatar, climate activists call on Islamic leaders to take a stand against global warming

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Why California's Proposition 37 should matter to anyone who cares about food

Norwegian artist illuminates the forest

The 'Airbnb for bikes' gets ready for national rollout

New book vividly captures climate change in action

How America can save money and stop wasting less food, water and energy

Nature and art collide in these whirling, animated stick sculptures

Sky shots capture the "horror and enchantment" of LA