Question

define global warming ,mention two causes for it

Answer 1

Almost 100% of the observed temperature increase over the last 50 years has been due to the increase in the atmosphere of greenhouse gas concentrations like water vapour, carbon dioxide (CO2), methane and ozone. Greenhouse gases are those gases that contribute to the greenhouse effect (see below). The largest contributing source of greenhouse gas is the burning of fossil fuels leading to the emission of carbon dioxide.

 

Answer 2

Increase of green house gases like carbon dioxide,methane in the environment leads to global warming

Two Causes are
1)deforstastion
2)burning of fossil fuel