Q: Cutting forests and clearing land has also increased the amount of what in the atmosphere?


Read this paragraph and choose the correct option from the provided answers:

Because of human activities, there is more carbon dioxide in the atmosphere today than in the past hundreds of thousands of years. Burning fossil fuels and has released great quantities of carbon dioxide into the atmosphere. Cutting forests and clearing land has also increased carbon dioxide into the atmosphere because these activities reduce the number of autotrophic organisms that use up carbon dioxide in photosynthesis. In addition, clearing often involves burning, which releases carbon dioxide that was previously stored in autotrophs.

 Choices:

- oxygen

- smog

- pesticides

- carbon dioxide


A:
carbon dioxide