Question

Which of the following is not a cause of global warming?

• A. Increased $\text{CFCs}$
• B. Rise of new viruses
• C. Deforestation
• D. Nitrous oxide

Answer 1

The correct option is B Rise of new viruses

Global warming is the increase in the temperature of earth's surface mainly caused due to the excessive emissions of greenhouse gases like ${\text{CO}}_2$ that trap the heat.

Trees help in absorbing ${\text{CO}}_2$ and reduce global warming. So, deforestation accelerates global warming. Nitrous oxide $\left({\text{N}}_2\text{O}\right)$ is a greenhouse gas. Chlorofluorocarbons $\left(\text{CFCs}\right)$ cause global warming by trapping heat.

However, evolution of new viruses cannot cause global warming. Instead, global warming causes viruses and other microbes to evolve and spread diseases.