Just a playful joke. He's a US politician who ran for president in 2016 as a third-party (i.e. no chance of victory) candidate.
At one point he was asked about his long term view on global warming, and he said "In billions of years, the sun is going to actually grow and encompass the Earth, right? So global warming is in our future."
At one point he was asked about his long term view on global warming, and he said "In billions of years, the sun is going to actually grow and encompass the Earth, right? So global warming is in our future."