Question

what is global warming and how it is caused

Answer 1

Global warming is the warming of earth due to which the glaciers and islands which are covered with ice started melting . It is caused by Green house gases like carbon dioxide and methane etc

Answer 2

Hey Friend, Here's Your Answer
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Global Warming, it's a severe problem in Earth!
It's Generally Indicated By Rise In Increasing
Temperature!

It's Generally caused because the increase in population due to which trees are repeatedly being cut for making houses. And Increase in No. Of Cars, Refrigerator, High Use Of AC!
These all Increase Number of CFC.

These all deplete the present Ozone layer!

Due to This global warming, Ozone layer gets depleted.

And Increase In Ozone hole, Allows UV Rays Directly from Sun!

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Hope This Helps...!!!!