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What’s wrong with putting a price on nature?

The concept of pricing ecosystem services and allowing them to be bought and sold has gained wide acceptance among conservationists in recent years. But does this approach merely obscure nature’s true value and put the natural world at even greater risk?

How no-flush toilets can help make a healthier world

Inadequate sewage systems and the lack of toilets in much of the developing world have created a major public health and environmental crisis. Now various innovators are promoting new kinds of toilets and technologies that use little or no water and recycle the waste.