Rubbish
We should recycle the rubbish
Deforestation
We should recycle paper to prevent deforestation
Water pollution
Water pollution is one of the environmental problems
global warming
Global warming is caused by human activities
Treaten
Air pollution threatens our health
Responsible for
We are resposible for our planet
Damage
Acid rain will damage old buildings
zero conditional
If you heat the water, it boils
first conditional
If you revise everything, you'll pass the test
second conditional
If i were you, I would call her
third conditional
If I had remembered, I would have called you
Face extinction
Every year more animals face extinction
Mammal
Baiji dolphins are the rarest freshwater mammals in the world
Overfishing
Overfishinf threatens fish
Overhunting
Overhunting threatens animals
