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.

New framework embraces uncertainty to make sense of history

There are many things we don't know about how history unfolds. The process might be impersonal, even inevitable, as some social scientists have suggested; human societies might be doomed to decline. Or, individual actions ...

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