On the other hand, you also have to view things clearly.
Petroleum emits a lot of CO2 into the atmosphere. It also emits some after combustion. However, the biggest problem we have right now is the radical increase in methane in the atmosphere. Methane has 86 times the strength of CO2 as a greenhouse gas. So all you need to do is emit one tonne of methane, which can come from anywhere in the oil and natural gas supply chain, to create a situation that is 86 times worse.