Setting a net zero target is like promising to clean up a big mess without making more messes. Imagine your room is really messy, and you decide to clean it up completely by picking up all the cups, clothes, and things lying around. But, you also promise not to make it messy again by putting things away after using them.
So, in the big world sense, setting a net zero target means trying to balance out the stuff that’s bad for the environment, like pollution from cars and factories, by doing things that are good for the environment, like planting trees or using cleaner energy sources. The goal is to have no extra bad stuff left over that hurts the planet.