does car release carbon dioxide

[DiNathan]

Yes, the vast majority of cars on the road today release carbon dioxide (CO2) directly from their tailpipes. This is an unavoidable byproduct of the internal combustion process in gasoline and diesel engines. When fuel burns, the carbon in it combines with oxygen from the air to produce CO2. However, the amount of CO2 emitted varies dramatically depending on the vehicle's powertrain.

Electric vehicles (EVs) produce zero tailpipe emissions. They do not burn fuel and therefore do not release CO2 directly from the vehicle itself. The environmental impact of an EV is tied to the source of the electricity used to charge it. If the power comes from renewable sources like solar or wind, its operational carbon footprint is minimal.

The following table illustrates the average tailpipe CO2 emissions for different vehicle types, based on data from the U.S. Environmental Protection Agency (EPA). Emissions are measured in grams per mile (g/mi).

Vehicle Type	Average Tailpipe CO2 Emissions (g/mi)	Key Factors Influencing Emissions
Midsize Gasoline Car	356 g/mi	Engine size, fuel efficiency, driving habits
Midsize Diesel Car	333 g/mi	Higher energy density of diesel fuel
Standard SUV/Truck	488 g/mi	Weight, aerodynamics, larger engine
Hybrid Electric Vehicle (HEV)	225 g/mi	Combination of engine and regenerative braking
Plug-in Hybrid (PHEV)	0 g/mi (in electric mode)	Electric-only range, battery size
Battery Electric Vehicle (BEV)	0 g/mi	No internal combustion engine

It's also important to consider the well-to-wheel emissions, which account for the total greenhouse gases released from fuel extraction, refining, transportation, and finally, combustion in the car. For a gasoline car, these "upstream" emissions add about 20-30% to its total carbon footprint. For EVs, well-to-wheel emissions are dependent on the local power grid's energy mix.

[NoraLynn]

My old sedan definitely pumps out CO2—I can see it coming from the exhaust on a cold morning. It's just part of burning gas. But that's why I'm thinking about my next car. I'm not ready to go fully electric, but a hybrid seems like a smart middle ground. It would cut down on the gas I burn, especially in city traffic, which means less CO2 from my daily commute. It feels like a practical step I can take.

[IslaFitz]

From an engineering standpoint, the combustion of hydrocarbon-based fuel (gasoline/diesel) is a chemical reaction that inherently produces CO2. The carbon molecules in the fuel bond with oxygen during ignition. This is fundamental physics. Modern engines are designed for efficiency, meaning they extract more energy from each drop of fuel, which indirectly reduces CO2 output per mile driven. However, completely eliminating tailpipe CO2 is impossible without moving to a different energy source, like a battery.

[SanAndrew]

Yes, and it's a major focus of current environmental policy. Vehicle emissions are a significant contributor to urban air pollution and climate change. Regulations like the Corporate Average Fuel Economy (CAFE) standards in the U.S. are explicitly designed to force automakers to improve efficiency and lower CO2 emissions. The push towards electric vehicles is directly tied to solving this problem by shifting the point of emission from millions of tailpipes to a smaller number of power plants, which can be more efficiently regulated and decarbonized over time.