An article by Michael Gerrard and Joseph Macdougald on the advancement of climate change litigation. It explores two approaches to climate change litigation; the first is to use the federal regulatory apparatus and the second is to use the tort system. The article explores key questions in climate change litigation such as, who is responsible for deciding the appropriate level of harmful emissions? How should courts handle the long tail effects of climate change? What are the proper forums to litigate in? And, what is the role of the federal government in climate change litigation?