Question

what is global warming?
what are the causes of global warming?
what are the effects on atmosphere of global warming?

Answer 1

Global Warming mean increase of green house gasses (carbon dioxide) in the environment.
Global warming leads to the increase in temperature of the atmosphere
and increase in the temperature of atmosphere leads to melting of ice caps, increase in sea level etc
pollution is one of the main cause of global warming   
such as smoke from the cars
burning of fossil fuels
mainly cutting down of trees

Answer 2

when ...the smoke from factories/industries are released it goes and reacts with ozone layer,ozone layer which acts as a blanket ...for earth protecting it/us from harmful ultraviolet rays ...the smoke or the pollutants cause holes in ozone layer allowing the harmful rays to enter the earths atmosphere ... so the when the rays hit the polar ice caps they melt and the sea level rises eventually leading....to drowning of the low ling lands/islands...and the harmful ultra violet rays can also cause harmful disease/skin cancer to us ...

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