Which of the following is not a reason for global warming?

1. Rise in the sea level
2. Ozone depletion
3. Deforestation
4. Burning of fossil fuel

Different types of weather phenomena is seen in

1. Ionosphere
2. Stratosphere
3. Exosphere
4. Troposphere

Wheat is one of the most important staple foods consumed globally, with the USA producing 8% of the world's total production. But the recent studies show that the wheat production is declining here due to adversely of climate.

As a geographical point of view can you state the specific reason to explain the fact?

Refer to the following statements from the geographical point of view consider the true statement and explain the reason.

Statement 1 - CO₂ is an essential component of atmosphere.

Statement 2 - Too much presence of CO₂ is harmful for nature.