How does the environment behaves with exhaust gas in vehicles, if their temp is being reduced before exhaust?

If the exhaust gas passes through a similar setup to that of the radiator, and then if it gets exhausted, with a lower temperature, the heat will be less and exhaust gas temp should be less and the water vapor effect may differ.

 

probably with some design change this can be achieved, this link the windmill one some what relates to what i am saying https://science.howstuffworks.com/environmental/earth/geophysics/manufacture-water1.htm

This is more of an subject that is related to evaporation and fractional distillation. Where the liquids of different temperature, losses heat or based on temperature they gets settled in the columns.  

Given that, apart from sea, rivers, the major presence of water is combustion, where it is present as water vapor in exhaust gas. Unlike the other experiments,where raw materials like hydrogen, oxygen will be used to form the cloud, so the water vapor which is one of the key factor for global warming can be put back into the water cycle. Hence the focus is to capture the water vapor from the readily available exhaust gas. We can imagine earth as huge fractional distillation column with varying temperature w.r.t. altitude, so the gases gets settled at different level. If the gases are cooled, their raise in the column gets affected there a good probability that clouds get formed at lower altitude where absorption of sunlight and green house effect gets reduced, because of both carbon and VP

The idea of separating the carbon and hydrogen can be done with a difference in temperature, given that carbon and water vapor has a difference in temperature. The idea of reducing the temperature of the exhaust gas can provide a probability of condensing or forming clouds at an lower altitude.The need is a better cooling system, with a coolant and air blast before the gas gets exhausted. The air captured can help in cooling the exhaust gas,though the fractional distillation of air is used to produce the industrial nitrogen and oxygen, still Water vapor and carbon dioxide are removed because they solidify at low temperatures, within the mixture of carbon dioxide and water vapor still there is a difference in temperature, that can serve to get separated at different level.

Just an experiment, with the usage of coolant in thermodynamics lab could help to study the behavior of this gases on the environment.  



Probable exhaust system, modified:
 

Usage of diluted isopropyl alcohol before the gas being let off
https://blog.gotopac.com/2017/05/15/why-is-70-isopropyl-alcohol-ipa-a-better-disinfectant-than-99-isopropanol-and-what-is-ipa-used-for/


 

Few questions to people who are researching :

few clarifications, how far https://www.quora.com/How-much-water-is-formed-by-the-combustion-of-1-litre-of-petrol is correct, at least in theory this looks to be correct, and even if we consider the efficiency of the engine, if we assume if 20 or 10 % is what Vapor gets released, still it is an good amount of water given that so many vehicles are running around the city, and consuming lot of gasoline.

As per assumption, Open system is assumed to be a heat sink, which may not be true given that at one point heat can't be dissipated due to the green house gases. Have you come across any paper on effect of green house gases w.r.t altitude ? I mean how these gases reacts when the altitude is less.Air at higher altitude are dry, less of water vapor, but vp content would have raised because of global warming even in higher altitude, so if the temperature of this VP in the exhaust is reduced, there may be a possibility of reducing global warming effect and probability of changing them to cloud.

In the video https://www.youtube.com/watch?v=MtMmgcZoTSA what is the role of alcohol ? Is there any other substitute for this especially for an hot exhaust gas? as it is flammable and if we use a diluted solution 70% rubbing alcohol will it help in some way ?

PV=nRT

If pressure is reduced after opening the cap of bottle, volume inc and  water vapor changed to cloud, ideally the same can be achieved as per my assumption by reducing temperature, do you think this is correct ?

ref:

Cloud formation in bottle:
https://www.youtube.com/watch?v=cXpuo3YHOn0 

how many liters of water can be produced from petrol:
https://www.quora.com/How-much-water-is-formed-by-the-combustion-of-1-litre-of-petrol
 

Can water be produced by combustion, pros and cons:
https://chemistry.stackexchange.com/questions/55664/why-dont-we-produce-water-from-combustion


Fractional distillation of air:
http://www.dynamicscience.com.au/tester/solutions1/chemistry/gas/fractionaldistilationofair.htm

http://www.minsocam.org/ammin/AM69/AM69_319.pdf