question_answer 38)

  Which of the following is a recently originated problem of environment? (a) Ozone layer depletion                                            (b) Greenhouse effect (c) Global warming                                                          (d) All of these

Answer:

  (d) Due to extensive use of vehicles and thermoelectric plants, gaseous emission from industries, use of aerosol propellants, refrigerants, shaving foams, spray agents etc. leads to the emission of various harmful gases like etc. in the atmosphere. These gases are major constituents of air pollution and are inter-linked in causing ozone layer depletion, greenhouse effect and global warming.