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1. 1.

   How is acid rain formed?

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   When fossil fuel is burnt, some of the elements within their...

2. 2.

   What is global warming and how does it occur?

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   The warming of the earth's atmosphere due to the increase in...

3. 3.

   What are the likely effects of global warming?

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   Increase in global temperature could have serious consequen...

4. 4.

   Why was air pollution very high in Delhi and what was done to reduce it?