Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?

(a) As Indians we continue to depend on fossil fuel heavily because of the lack of investment in research and development in other forms of energy which are so readily...

(b) The essential message conveyed by the passage is that it is absolutely essential to reduce to a very great extent the emission of greenhouse gases into the atmosphere.

(c) Sugarcane ethanol is an alcohol-based fuel produced by the fermentation of sugarcane juice and molasses. Because it is a clean, affordable and lowcarbon biofuel, sugarcane ethanol has emerged as...

(a) when fossil fuels are burned at high combustion temperatures. 

(d) The oxygen concentration in atmosphere is 21%. The oxygen cycle is effected by human activities such as running automobiles and consumption of fossil fuels which release more carbon dioxide...

(i) Combustion of fuel (ii) Industrial activities

(a) Air Pollution: This kind of pollution is caused by the emission of harmful gases into the atmosphere. Smoke and chemicals emitted by factories and vehicles degrade the air quality...

Pollution caused by the burning of fossil fuels can be controlled by the increasing the efficiency of combustion process and by using various techniques to reduce the escape of harmful...

(a) X = Carbon (b) Another element which is usually found in combination with carbon in fossil fuels is hydrogen.

(a) Catalytic converter  (b) It converts poisonous carbon monoxide into non-poisonous carbon dioxide and harmful nitrogen oxides into harmless nitrogen gas.