Ancient societies hold lessons for modern cities

Today's modern cities, from Denver to Dubai, could learn a thing or two from the ancient Pueblo communities that once stretched across the southwestern United States. For starters, the more people live together, the better ...

How much difference can one degree of warming make?

A vicious cycle of warming temperatures and reduced snowpack in northern forests is more severe than climate models have shown and could lead to increased fire risk and permanent damage to ecosystems.

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