Answer :
Global warming is caused by increase in temperature of the earth and also because of the increase of carbon dioxide in the atmosphere. The increase of carbon dioxide produces green house gas which traps heat and is the main cause of melting glaciers and it causes floods.
Global warming is the rise in world temperature due to the presence of some gases like carbon dioxide or methane. its effect on animals and humans are shocking. the main cause of global warming is the emmision of carbon dioxide from the factories, vechicles etc it is also caused due to the emission of methane by animals, agriculture such as paddy and Arabic seabeds. the main reason behind global warming is deforestation. the effects of global warming are frightening once. one effect is the rise in the sea water level, organisms cause diseases, massive crop failure, wide spread extinction of species. etc