Erosion of soil has a negative impact on the environment.
Soil erosion deforestation and excessive crop irrigation enhance soil erosion.
Deforestation and excessive crop irrigation enhance negative impacts on the environment.
what and excessive crop irrigation enhance negative impacts on the environment
  - contamination
  - drought
  - humans disturb it
  - Pollution
  - Greenhouse gasses
  - Deforestation
  - uncontrolled
  - threatened