Indiscriminate use of $DDT$ is undesirable because

Which of the following is wrong with respect to our responsibility as a human being to protect our environment?

How can photochemical smog be controlled?

Sewage containing organic waste should not be disposed of in water bodies because it causes major water pollution. Fishes in such polluted water die because of:

Fill in the blanks:
$(1)$ Carbon dioxide is found in the ................. layer.
$(2)$ $A$ high concentration of carbon dioxide is responsible for ................. .
$(3)$ ................. gas is used in air conditioners.
$(4)$ Acid rain causes damage to the ................. monument (wonder).

Which of the following statements is incorrect?