The United States Climate Alliance is a group of states in the United States that have come together to fight against climate change. These states have all committed to reducing their carbon emissions and to work together to protect the environment. They do this by using clean energy sources, like solar, wind, and water, instead of using fossil fuels. They are also working together to create more efficient buildings and cars, and to protect forests and other wildlife areas. By doing this, they hope to help slow down the effects of climate change.