Iwant to know about that practice that human being do unknowingly to facilitate environment degradation? at least two answers

The practice that human being do unknowingly to facilitate environment degradation is:

1)  Man is unknowingly cutting down large amount of trees in order to accommodate himself or his businesses which is a practice contributing to environment degradation.

2) Over population is another practice which felicitates environmental degradation, as mentioned above, man is cutting forests to accommodate his needs leading to environmental degradation. 

Personally i think it is a