What are the effects of man made fire on the environment?

There are two types of fires

1 man made fires

2 natural fires

as natural fires cause many smoke but are caused rarely such as forest fires they are less harmfull to the environment but man made fires had made can many harms to environment . They also produce many smoke and are use most wich is harmfull to ozon layar. It is the best example of global warming. they are good for humanbeings but not for nature.