The Regional Greenhouse Gas Initiative, or RGGI, is a group of states in the northeastern United States that work together to reduce the amount of pollution (called greenhouse gases) that comes from creating energy.
Greenhouse gases are a big problem because they can trap heat from the sun in the Earth's atmosphere, which causes the planet to get warmer. This can lead to lots of problems, like rising sea levels, more severe weather, and harm to plants and animals.
The way RGGI works is that each state sets a limit on how much greenhouse gas its energy producers (like power plants) can emit. If a company produces less, it can sell its unused allowance to companies that produce more. This gives companies an incentive to reduce pollution, because they can make money by doing so.
The money that is raised from selling these allowances goes back to the states, and they can use it to fund programs that help the environment and the communities that are affected by climate change.
Overall, RGGI is a way for states to work together to fight climate change and protect the planet for future generations.