Cutting greenhouse gas emissions rapidly and immediately will save lives, livelihoods and ecosystems around the world, scientists say. And there are lots of ways to go about it.

The good news is that the world has solutions and technology to slow climate change. The bad news is that time is running out.

Some ecosystems have already been irreversibly altered, scientists say. And climate change is wreaking havoc on human health.

Scientists who warned of heat waves and rising seas this week also say that it's possible to avoid the worst effects of the warming climate. They're relying on computer models of the world economy.

The latest report from climate scientists provides a stark warning about how fast the planet is changing. Here are the top takeaways.

The U.N. has released the most comprehensive global climate science report ever. It is unequivocal: Humans must stop burning fossil fuels or suffer catastrophic impacts.

Hundreds of scientists are meeting to finalize a landmark climate report. It's meant to guide the next decade of international climate policy, but it's unclear if politicians will act on it.

China is investing in both coal and renewable energy, the European Union promises to dramatically reduce carbon emissions and the U.S. is leaving the Paris Agreement altogether. What will 2021 hold?

Scientists from around the world are writing the next major United Nations climate report. Summarizing the state of the atmosphere without meeting in person is as hard as it sounds.