Question

46 (b) Suggest two processes which put back carbon dioxide into the air.

Answer 1

1. Burning of fossil fuels:

• Combustion of fossil fuels is one of the largest contributors to carbon dioxide,
• In industrial cities or metropolitan cities, the burning of oil, natural gases, and coal releases high amounts of carbon dioxide.

2. Respiration by plants and animals:

• Plants have stomata on their leaves which consume oxygen. This process is called respiration.
• It releases carbon dioxide.
• Similarly in humans and animals, respiration is the consumption of oxygen which releases carbon dioxide into the air.