How humans affect plant life?

Answer:
There are many ways humans affect plant life, some being positive, some negative.
Many negatives affects are caused greatly by construction. For example, if you were in a forest and people started cutting down trees and bushes to build buildings many plants would be destroyed.
First answer by Napoleon Dynamite. Last edit by Napoleon Dynamite. Contributor trust: 220 [recommend contributor recommended]. Question popularity: 0 [recommend question].