Moderate

Today, concentration of green house gases is high because of:

Correct answer: D. All the above

  • A. Use of refrigerator
  • B. Increased combustion of oil and coal
  • C. Deforestation
  • D. All the above

Explanation

Refrigerants can release CFCs, fossil-fuel combustion adds CO2, and deforestation both releases stored carbon and reduces its removal by forests. Therefore, all three activities increase greenhouse-gas concentrations.

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