In general, loss of species that perform unique functions and have few close relatives (in evolutionary terms) would cause the most disruption.
Roofs account for 25% of total surface area in most cities, and pavement accounts for around 35%. If 100 major cities covered that space with reflective materials, it could offset as much as 44 metric gigatons of heat-trapping gases.
"It's a little bit like a free lunch without the calories," says Dr. Ronald Evans, lead researcher of the Salk group. It's a bird, it's a plane, it's... exercise in a pill! Wait -- we've been promised this before...
Why do teens get eating disorders? Blame it on their friends! But wait, it's not that simple. In fact, it doesn't matter which group teen girls actually fall into, but only which group they most identify with.
Whether you're drooling over a celebrity or the petite waitress at your favorite club -- we have to work hard to get there and stay there.