I'm interested in how accurate "America’s Dirtiest Carbon Polluters" is when they are measuring "CO2 emissions from fossil fuel combustion". I assume the majority of carbon pollution comes from fossil fuel combustion, but that is just an assumption. It would be nice to have that explicitly shown.

A quick search suggests %90 percent of human caused CO2 emission is from fossil fuel consumption (things like calcium carbonate produce half of cement emissions). All cause emissions of CO2 dwarfs human emissions, but as part of a cycle that consumes CO2 as well.