Greenhouse gases are responsible for global warming. They enter our atmosphere either naturally or anthropogenically. Match column I (containing greenhouse gases) with column II (containing their source) and select the correct option from the given codes. Column I Column II 1. Carbon dioxide a. Livestock farming 2. Methane b. Use of air conditioner 3. CFCs c. Fossil fuel combustion 4. Nitrous oxide d. Cement production

Greenhouse gases are responsible for global warming. They enter our at

1.	Greenhouse gases are responsible for global warming. They enter our atmosphere either naturally or anthropogenically. Match column I (containing greenhouse gases) with column II (containing their source) and select the correct option from the given codes. Column I Column II 1. Carbon dioxide a. Livestock farming 2. Methane b. Use of air conditioner 3. CFCs c. Fossil fuel combustion 4. Nitrous oxide d. Cement production
A.	1-d, 2-a, 3-b, 4-c
B.	1-a, 2-d, 3-c, 4-b
C.	1-c, 2-b, 3-d, 4-a
D.	1-b, 2-d, 3-a, 4-c
Answer» B. 1-a, 2-d, 3-c, 4-b

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