Question

how to global warming cause?

Answer 1

we know that the trees take Co2 and give us oxygen. But if we cut off the trees then the Co2 will increase and this results in global warming

Answer 2

Answer:

Due to excess use of vehicles, huge amount of toxic gases are released into the atmosphere. The gases emitting from factories also cause pollution. These gases go up into the atmosphere. They have made holes into the ozone layer. Ultraviolet rays of sun are coming to earth. They reach to the earth and cause global warming.