How climate drives bird migration

How climate drives bird migration
A strange form of bird migration fails to follow the usual seasonal pattern. How does climate set the pine siskin to flight? More »

Drought + food = instability?

Drought + food = instability?
As California parches, we look at drought in the "Arab Spring" and China's Great Leap Forward. How are drought and famine related? More »

Menace to monarchs

Menace to monarchs
20 years ago, up to 1 billion monarch butterflies wintered in Mexico’s mountains. This January, a few tens of millions are roosting More »

Brewing biofuel

Brewing biofuel
The struggle to make fuel from wastes from farm, factory and forest continues. What’s keeping cellulosic biofuel out of the market? More »

Stopping the slaughter of the bats

Stopping the slaughter of the bats
In 7 years, white-nose syndrome has spread to 24 states and 5 provinces. Why is the fungus so deadly? Why don’t bats die in Europe? And More »