see

destroy

lose

cause

increase

Global warming is (a) _____ day by day. It is mainly (b) _____ by the destruction of forests. Every day we are cutting down trees recklessly, but not planting a single one. As a result, wild animals are (c) _____ their living places. Many birds and animals are (d) _____ no more. This loss is posing a threat to our environment by (e) _____ the ecological balance.