California has been the leader in instituting rules and regulations that support the protection of the environment, but many states have followed suit and are likely to adopt similar regulations. The U.S. Climate Alliance, which was established in 2017, is a bipartisan coalition of governors committed to reducing greenhouse gas emissions. What was once a commitment of 16 states and Puerto Rico has grown to 25 members, representing 55 percent of the U.S. population and an $11.7 trillion economy. This Alliance has pledged to implement policies aiming to reduce greenhouse gas emissions, track and report their progress and facilitate new and existing policies to reduce emissions and promote clean energy deployment.