Urban wastelands worth millions for what they give us

New Scientist: Waste space in cities isn't a waste of space. Most people see vacant and abandoned land as an eyesore, or being ripe for development, but it has a substantial ecological value in its own right. The abandoned land in a single city can be worth hundreds of millions of dollars. All ecosystems provide us with free "ecosystem services": useful things that we would otherwise have to do ourselves. Forests clean the rivers that pass through them, providing safe drinking water, and growing plants remove......

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