Question

Which action by humans had had the most positive ecological impact on the enviroment ?

Answer 1

A positive human impact on the environment occurs when a person takes action to improve society, nature and its resources. Acting positively, even in a small manner, has a major impact on the environment, especially when it is done consistently

Answer 2

Reforestation, and covercropping to cover soil erosion, if this is from the passage I think it's from.