Arizona’s decision to join the U.S. Climate Alliance could rev the state’s clean energy economy, some observers said, but others warn that politics could get in the way.

Nevada Gov. Joe Lombardo withdrew the state from the U.S. Climate Alliance, citing a conflict between their goals and his regarding Nevada's energy portfolio.

The U.S. Climate Alliance noted its fifth anniversary, celebrating its achievements while acknowledging the increasing impact of climate-related disasters.

States and provinces in the U.S. and other nations are leading efforts to address climate change while their national governments often lag.

States are “moving the needle” on climate change but must continue challenging the federal government and each other, members of the U.S. Climate Alliance say.

Groups say Murphy talks aggressively on climate change but is moving too slowly to cut GHG, while the DEP continues to approve natural gas projects.

States that have set goals to reduce greenhouse gas emissions have yet to implement sufficient policies to meet their pledges, an EDF said.

Pennsylvania Senate Minority Leader Jay Costa wants other lawmakers to sign onto his plan to cap energy sector emissions.

Pennsylvania joined the U.S. Climate Alliance after releasing its own action plan to achieve a 26% reduction in statewide greenhouse gas emissions by 2025.