Which of the following production activities is the largest emitter of CO?

Correct option is D

The correct answer is (d) Thermal power production

Explanation:-

• Coal-fired power plants emit elevated levels of CO. For example, one study found that lignite coal-fired power plants emitted CO at rates 22 to 34 times higher than those reported in state and federal emissions inventories.
  
• Carbon dioxide (CO2) emitted from thermal power plants accounts for approximately 40% of energy-related CO2 emissions in the world.