YouTube is an influential force in politics. It's also rife with disinformation and conspiracy theories. A new report shows that YouTube's algorithm is actively recommending fringe climate denial videos. What will it take to solve the problem?

Producer Jaime Kaiser falls down the YouTube rabbit hole. Then, Vox writer David Roberts discusses the underlying social and psychological forces that may prevent YouTube from taking action.

Later, we speak with reporter Chris Walljasper about how voters are wrestling with the climate issue at the Iowa Caucus.