It’s been 100 years since the last passenger pigeon died. Would we have been able to save the bird today? What is the state of bird conservation in North America? Gary Langham of the National Audubon Society and Ken Rosenberg from the Cornell Lab of Ornithology discuss which species are under threat and how climate change might affect birds in the future. Plus, read more about one particular bird that could be affected in this piece of Sci Candy.