By Sid Perkins
By the end of this century, the world’s hottest desert will be even hotter. The
Sahara will also be smaller and drier than it is now, according to an
international team of climate modelers.
The Sahara stretches the full width of northern Africa and now covers an area the
size of the United States. But that area isn’t constant: It can swell and shrink
significantly in response to long-term weather patterns, says Gerald A. Meehl, a