Watch Bill's interviews with a range of leaders, thinkers and doers on the front lines.

For some, the damaging effects of global warming are happening now, and they need help from wealthy countries responsible for decades of greenhouse gas pollution.

The money keeps flowing - not only to politicians but also to efforts aimed at undermining climate science.

Demonstrators Monday sought to link Wall Street's casino capitalism to climate change.

The new short, narrated by Morgan Freeman, premiered before world leaders on Tuesday at the UN climate change summit. Watch it here, along with an interview with the filmmakers.

Days ahead of a UN climate summit, demonstrators in New York City urged world leaders to confront global warming.

For some congressmen, a hearing to discuss oil train safety is just as good an excuse as any to bully scientists.

We still have the ability to correct our course – the future is entirely in our hands.

Kelsey Juliana, an 18-year-old activist, is fighting climate change in the courts and walking across the country to spread the word on global warming.

In order for a climate agreement to be worked out, wealthy nations will have to engage with some of the questions that poorer nations are asking. Here are five big ones.