Q. Consider the following statements:

1. Carbon dioxide released in the atmosphere creates a greenhouse effect.
2. Without Carbon dioxide the earth would have been too hot to live in.
3. The increased level of Carbon dioxide is causing global warming.

Which of the above statements is / are correct?
Answer: Only 1 and 3
Notes: Statement 1 is correct as Carbon dioxide contributes to the greenhouse effect by trapping heat. Statement 2 is incorrect; without CO₂, Earth would be too cold, not too hot. Statement 3 is correct, as rising levels of atmospheric CO₂ lead to global warming due to enhanced greenhouse effect.