Q9 of 269 Page 161

The major cause of environmental pollution is the use of :

Gases released by the burning and combustion of fossil fuels include carbon monoxide, nitrogen oxides, sulfur oxides and hydrocarbons. In the air, these gases become a carcinogen, which can be inhaled and can also mix with falling rain to form acid rain.

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7

What are the environmental consequences of the increasing demand for energy?

 8

What steps would you suggest to reduce energy consumption?

 10

The world's known coal reserves are expected to last for about:

 11

The fossil fuel whose known reserves in the earth are expected to last for the minimum period is :