B1 – 2-4.3

1. Human intervention in the environment has caused the loss of . 
2. River embankments, and structures of all kinds alter the surface and underground waters, causing some regions to dry out or excess humidity in others.
3. The  of water and the atmosphere causes the disappearance of various species of animals and plants and undermines human’s health. 
4. The , less and less absorbed by the soil degraded by or irrational exploitation, flows rapidly into the riverbeds and can give rise to serious .