Liberal activist Tom Steyer heading to UN climate conference

U.S. politicians are mostly sitting out next week's big United Nations climate conference in Poland, but at least one notable political activist is going: Tom Steyer.

Why he matters: Steyer, a billionaire who made his money from hedge funds, is a likely 2020 presidential hopeful and has made climate change a key pillar of his national activist agenda. He'll be there for a few days at the end of the first week and stay through the start second, per a spokeswoman.

Go deeper:

• U.S. politicians sit out big climate conference
• Tom Steyer is becoming the Koch Network of the left