You're listening to WEEKEND EDITION from NPR News. A study published in the journal "Nature Climate Change" says, the population of Emperor penguins in Antarctica is in danger. Hal Caswell is a scientist emeritus at the Woods Hole Oceanographic Institution. He co-authored the report. And he joins us from Amsterdam. Welcome.
HAL CASWELL: Thank you.
WERTHEIMER: You've been studying the Emperor penguin population in Antarctica. What's happening to them?