Answer:
(i) Causes of global warming. Most important cause of global warming is increased production of greenhouse gases like (produced mainly by burning of fossil fuels, volcanic eruption and respiration); chlorofluorocarbons (used ill refrigerators, air conditioners, etc.); oxides of nitrogen and methane.
(ii) Effects of global warming. Global warming is characterized by increased global temperature. It will increase melting of polar ice and increase in sea level which may submerge low lying coastal cities round the globe. It ma y also cause red used production of grains, declined annual monsoon rains, increased desertification, etc.
(iii) Control measures
(a) Reduce consumption of fossil fuels like coal, petroleum, etc.
(b) Decreased deforestation and stress on reforestation and afforestation.
(c) Control of human population growth.
(d) Improving energy efficiency.
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