# How to change CO₂ to a less polluting gas?

I want to change $\ce{CO2}$ coming out of the tailpipe of a car to some other compound that is considerably less harmful to the environment with a filter of some sort.

What are some ways that this is possible?

$\ce{CO2}$ to carbon and oxygen?

• Actually, $\ce{CO2}$ is already very less "polluting" as compared to other gases in the exhaust like $\ce{NO_x,SO_x,CO}$ and unburnt hydrocarbons. To eliminate $\ce{CO2}$ while still using a combustion engine will not be practically feasible, since $\ce{CO2}$ is the final oxidation product for all "organic" fuels. You can shift to an alternative power source (Hybrid, Electric) to eliminate $\ce{CO2}$. Otherwise, an engine which emits only $\ce{CO2}$ and $\ce{H2O}$ is pretty non-polluting engine by practical standards. – stochastic13 Oct 15 '13 at 4:37
• @SatwikPasani Thanks for your edit! I have reverted the title formatting back due to this issue. It's not a big problem, just wanted to let you know for future edits. – jonsca Oct 15 '13 at 5:50
• Since cars are inherently going to pollute would it then be a better idea to filter out all carbon particulate matter? even from non-diesel engined cars? Thank you both for the answers by the way. – Derek Oct 15 '13 at 16:39
• @DerekSmith A pragmatic approach would be to eliminate automobiles altogether. – LordStryker Dec 18 '13 at 14:47

It makes no difference where you grab the $\ce{CO2}$. Don't burden the car.