So, in The Lord of the Rings there are a lot of different creatures living in the world called Middle-earth. There are hobbits, elves, dwarves, men, and many others. But there is also this big bad guy named Sauron who wants to take over the world and destroy everything in it. And in order to do that, he uses a lot of really bad stuff like fire and pollution.
But the good guys in The Lord of the Rings, like Frodo and Gandalf and Aragorn, they care a lot about the environment. They want to protect all the trees and the animals and the water in Middle-earth. They know that if Sauron takes over and destroys the land, then there won't be anything left for anyone to enjoy.
So, they try to stop Sauron from using his evil powers to hurt the environment. They fight against his armies and try to destroy the magical ring that gives him so much power. They also try to help the trees and creatures in Middle-earth, like the Ents who are giant tree-like beings, by giving them a voice and standing up for them.
In short, the environment is really important in The Lord of the Rings, and the good guys want to protect it from being destroyed by the bad guys.