There's a patch of seashore along the coast of Argentina where hundreds of thousands of penguins make their home. It's called Punta Tombo. Dee Boersma, a conservation biologist at the University of Washington, has been going there for 30 years, and she's discovered that a changing climate is killing those penguins.
I visited Boersma in 2003 for NPR's Radio Expeditions program. She literally lived amid the colony, the world's largest group of Magellanic penguins. Even then, she was worried. Penguin numbers had been dropping, as much as 20 percent below their original population.