Why do right-wing men hate Greta Thunberg and Alexandria Ocasio-Cortez so much? Researchers have some troubling answers to that question.

Climate change is accelerating the spread of lethal algal blooms in American waterways—with devastating results for humans and animals alike.

To avert global catastrophe, we urgently need to resurrect the ancient ideal of solidarity.

Few humans hold more responsibility for the unfolding climate crisis than David Koch, the 79-year-old oil magnate who died this week.

Supporting indigenous people's projects could be more effective than trying to persuade the openly dismissive Brazilian government.

The attempted erasure of Indigenous people and the land they steward continues with Trump's latest proposal.

Obama failed to make big changes after the last economic crisis, and that meant painful losses for the president, his party, and the American people.

Democrats are seeking advice from people who once opposed action on global warming. They should be seeking accountability.

In Brazil, a struggle over the future of the Amazon is taking place. The struggle will have global impact.

Climate change has left a graveyard of abandoned ski resorts on the Italian Alps—and a dwindling population of gravekeepers.

The CNN debates paid a historic amount of attention to the climate crisis—but were still embarrassingly behind the curve.

Anyone who says otherwise isn't taking climate change seriously.

Jay Inslee says the next four years "is our last chance ... to do something about it." Is he right?

A moderate alternative to the Green New Deal, "100 by '50" proposes to wait until the last possible moment to halt global warming.

This crisis deserves far more than 15 minutes of airtime.

Global warming is causing mass migrations around the world. In New York, it's forcing people from their homes in quieter ways.

From exploration to Cold War militarization, how the Arctic became the focus of the climate crisis.

The dual threat of late-season river flooding and early-season hurricanes is a sign of things to come for our warming world.

The president claimed on Monday that America is doing a great job of protecting the environment.

More than 50,000 Americans unwittingly live within 650 feet of natural gas wells, which are poorly regulated and can leak or explode.