The Large Cities Climate Leadership Group is a group of big cities around the world that work together to help reduce the amount of pollution that we create and make the Earth a healthier place. It's like a club, but instead of playing games and having fun, they work on how to protect the planet.
You know how when you see smog or smoke coming out of cars or factories, it's not good for the air we breathe? Well, the leaders of these cities want to make sure that we don't have too much of that kind of air pollution.
So, they get together and talk about how to make their city use less energy and create less pollution. They might talk about ways to use more renewable energy, like wind or solar power, which don't create as much pollution. They might also talk about ways to make people use public transportation more, like buses or trains, so they don't have to use their cars as much.
The cities in this group are really big and important cities, like New York City, Paris, Tokyo, and London. When these cities work together, they can create big changes that help the whole world, because if one city makes changes to help the environment, it can inspire other cities to do the same thing.
Overall, the Large Cities Climate Leadership Group is a group of leaders who want to help protect the Earth and make it a better place to live for all of us, even if it means making some changes in the way we use energy and create pollution.