Question

What has raised the percentage of carbon dioxide in exhaled air

Answer 1

green house gases and the pollution that we release from vehicles

Answer 2

Answer:

There are multiple factors that increased the amount no carbon dioxide in our environment.

Explanation:

Deforestation is one of the biggest reason for the increase in greenhouse gases.

Burning of fossil fuels is another big reason for the increase in fossil fuels.

Volcanoes are another natural reason for the increase in the greenhouse gases.

Forest fires also contribute in the build-up of fossil fuels.