How do natural events and human activities affect the environment?

Well what we put out there personally can either be good or bad for the environment. Suck as littering. Which all people know is bad for out environment/community making nature and human life more unsafe. While we could be growing more plants simply in our back yards. Which is good for the health of us and animal, nature. 

While natural events that transpire (happen) are all good because people get the goodies of the wildlife or the natural resources that grow around the world. Natural is all good. But human activity not so much.

People where both good and bad for the community because of the plants

Mg is used to measure mass