From lawns to flood irrigation, here are five ways that people waste water, and more efficient ways they could use that water instead.
The world's population is projected to hit 11 billion by 2100. Not only will we have to feed all these people, but we'll have to do it in a way that's less taxing on the earth's resources.
The new projection is 8 percent higher than a previous estimate, largely because fertility is declining more slowly in Africa than predicted
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