223K views · 191 reactions | Nearly two-thirds of North American birds studied will go extinct if global warming hits 3 degrees Celsius (5.4˚F), a new report from the National Audubon Society finds. The stark warning follows research published last month that showed the US and Canada had lost 2.9 billion birds in about the last 50 years. CNN's Bill Weir reports. https://cnn.it/314nnfs | CNN Replay | Facebook

1.7M views · 50K reactions | ▲ ‘Holocene, Pt. ll’ for the day after...