Pollution is on of the major factors of global warming.Little things can make this situation worse.Global warming is called by burning fossil fules whic releases CO² pollution into the air
Desforestation also play's a big part in global warming, tree's keep the air clean but with people cutting down tree's to make houses destroyes the air basicly.
Farming plays a part aswell, livestock prouduces methane which is a green house gas. Methane is bad for the air.