[carbonbrief.org]
Where Does Carbon Dioxide Come From
Natural sources of carbon dioxide include most animals, which exhale carbon dioxide as a waste product. Human activities that lead to carbon dioxide emissions come primarily from energy production, including burning coal, oil, or natural gas.

Moreover,where does carbon dioxide come from naturally?

Yes, there are natural sources of atmospheric carbon dioxide, such as outgassing from the ocean, decomposing vegetation and other biomass, venting volcanoes, naturally occurring wildfires, and even belches from ruminant animals.

Subsequently, question is,where does most carbon dioxide come from? Consumption of fossil fuels accounts for most of the CO2 emissions of the major energy consuming sectors: commercial, industrial, residential, transportation, and electric power.

This guest post is by:

Dr Jamie Shutler, associate professor in earth observation at the University of Exeter.

Prof Andy Watson, Royal Society research professor at the University of Exeter.