Positive and negative effects on the environment

Write and Explain the kind of effect( positive or negative or both) the following have on the environment and why. 
This requires research. 
1. Riding ATV's Over the Land.
Riding ATV's is a negative effect on the environment because it ruins the land and effects the world terribly. It kills plants that are living and ruins the grass also can accidentally kill an animal.

2. Wind Turbines from wind farms. 
Wind turbines are a positive effect on the environment because we use them for less fossil fuel. 

3.Flooding

Flooding is a negative effect to the environment because it flooded fields and kills all the stuff that was planted there and kills other plants and trees.