Q: What has the burning of fossil fuels increased in the atmosphere?


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

Ocean water normally dissolves some of the carbon dioxide in the atmosphere. The burning of fossil fuels has increased the amount of carbon dioxide in the atmosphere. As a result, ocean water is also dissolving more carbon dioxide. When carbon dioxide dissolves in water, it forms a weak acid. With higher levels of dissolved carbon dioxide in ocean water, the water becomes more acidic. This process is called ocean acidification.

 Choices:

- ozone

- oxygen

- temperature

- carbon dioxide


A:
carbon dioxide