Is planting more trees actually good for the environment? You plant a tree and it grows taking co2 from the air after a 100 years of so it dies it rots and rel

Is planting more trees actually good for the environment? You plant a tree and it grows taking co2 from the air after a 100 years of so it dies it rots and releases all the c02 it captured. What we need to do is massively reduce the amount of gress house gasses we release and then work on taking out of the air in a way that won't put it back in again.