Planting trees has a positive impact on an ecosystem.
Destruction of trees is taking place, pollution of air is the result of cutting trees with pace.
Stopping air pollution has a positive effect on an ecosystem.
What has a positive effect on an ecosystem?

1. maintaining air pollution
2. removing habitats
3. stopping air pollution
4. to stay warm
5. in the frog family
6. Electric generators
7. increasing air pollution
8. genetic diversity