Question

What are the causes of global warming?

• A. Burning of coal and petroleum products
• B. Deforestation
• C. Methane gas released in animal waste
• D.
  All of the above

Answer 1

Answer: (D)

All of the above

Global warming is caused due to the excess presence of greenhouse gases like carbon dioxide, methane, nitrous oxide and ozone in the atmosphere.

Burning of coal and petroleum products produce carbon dioxide, which is a greenhouse gas.

Deforestation reduces the number of trees which convert carbon dioxide into oxygen by photosynthesis and thus, the amount of carbon dioxide in atmosphere increases.

Methane is a greenhouse gas, so it also causes global warming.