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Air is one of the world's most vital renewable resources. It is also one of the "commons", which makes its protection difficult. Its pollution could become the source of major global political conflicts, even of a shift in the world power structure. Damag...

No matter who we are, where we are, and what we do, we are all dependent on water. We need it every day, in so many ways. We need it to stay healthy, we need it for growing food, for transportation, irrigation and industry. We need it for animals and plan...