Question

Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?

oxygen
nitrogen
water vapor
carbon dioxide

Answer 1

According to Nasa.gov, over the century, there has been a large increase of Carbon Dioxide due to fossil fuels. The reason being is coal or oil process combines Carbon and Oxygen from the air to make CO2 (Carbon Dioxide).

Answer 2

Answer: carbon dioxide (CO2)

Step-by-step explanation: