causes of global warming are:-
1. the factories release gases like CO2 which is a green house gas and cause global warming.
2.vehicles release some gases which cause global warming.
3. burning of fossil fuels like coal. oil.
4. cutting or burning trees, or forest fire.
5. during the break down of food, CO2 is released.
its effects are that it increase the temperature of the earth leading to the melting of glaciers which can rise the sea level, which will result into flooding of coastal and low lying areas.