Question

The greenhouse gas that is a product of the combustion of fossil fuels is 

(a) CO₂ 

(b) CH₄

(c) O₂

(d) N₂O

Answer 1

(a) CO₂

All emission estimates from the Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-2021. The main human activity that emits CO₂ is the combustion of fossil fuels (coal, natural gas, and oil) for energy and transportation. Certain industrial processes and land-use changes also emit CO₂.