1. PUBLIC OPINION
A 9-foot giant with claws enters the climate debate
Hudson the polar bear is a star attraction at Chicago's Brookfield Zoo, where visitors come to watch him romp and swim in the new "Great Bear Wilderness" exhibit. But the bear's keepers, gravely concerned about climate change, have their eye on a different wilderness: the tangle of conflicting opinions about climate change among Americans. They see a captive audience in the roughly 180 million Americans who visit a zoo or aquarium each year.
Exporting carbon? 
