This Article highlights the role of advocates in pushing government to step up to the challenges of reducing greenhouse gas (GHG) emissions and remaining steadfast through continued policy enforcement. The authors, who participated in the development of the Massachusetts Global Warming Solutions Act, provide insights regarding climate legislation, regulation, and litigation in a state committed to addressing climate change.

The year 2015 marked a new era in climate efforts under the United Nations Framework Convention on Climate Change when the nations of the world signed a new implementing agreement in Paris, France.

Section 401 certification and permit conditioning under the Clean Water Act is one of the most significant tools for states to influence federally permitted activities involving discharges into navigable waters. However, states are required to set conditions within one year or they forgo their ability to do so. In practice, the one-year review is difficult for states to meet and led to a common practice known as “withdraw and resubmit” in which states could reset the clock. But in Hoopa Valley Tribe v. Federal Energy Regulatory Comm’n, the D.C.