Catastrophic global warming can be staved off if humans can keep the climate from warming more than two degrees Celsius, and emit less than 565 Gigatons of carbon dioxide, some scientists believe. But environmentalist Bill McKibben says that's not enough.
Four years ago, there was political consensus that climate change was one of the most pressing issues facing the world and the U.S. But now, after a great deal of spending and lobbying, politicians are refusing to do anything about it. A new documentary looks at why.
A number of college students across the country are trying to convince the administrators running their endowments that for the good of everyone, they need to stop investing in fossil fuel companies. A similar effort around South African businesses was an important part in ending apartheid.
Bill McKibben is the closest thing the grassroots climate movement has to a celebrity. Co-founder of 350.org, he catalyzed opposition to the Keystone XL pipeline and is now urging institutions around the country divest their holdings from fossil fuels. His new book, Oil and Honey, is half activist memoir, half meditation on beekeeping in Vermont.
Canada's Prime Minister Justin Trudeau promises to make steep cuts in climate pollution while still increasing the flow of dirty tar sands oil. It's a high-wire act that has him taking fire from both sides.