Green chemistry is what scientists use to make things in a way that is better for the planet. It's like when we clean our room without using chemicals that are bad for us or the environment.
There is a special journal called "Green Chemistry" where scientists share their ideas about how to make things in a better way. They write about how to use materials that are not harmful to the environment or people, and how to use less energy to make things. This means that the things we use and the things we make won't hurt the planet.
So, just like how we try to be careful with our toys and not break them, scientists try to make things in a careful way that won't hurt Earth. And they share their ideas in the "Green Chemistry" journal to help others learn how to do it too.