Comment Re: Phasing out the wrong thing (Score 1) 270
Presumably, they mean zero net emissions, which is possible. You completely combust all of the fuel in the car, a plant somewhere removes the combustion byproducts from the air and puts it back together as fuel, and the car burns that fuel. They would also need to break down the NOx to N2 or convert it to something long term stable.
It's essentially using the fuel as a battery. For hard to electrify things like planes and rockets. You built enough renewable energy and normal storage to get your grid through most bad times of year, that gives you a lot of excess energy throughout the year. You use the excess energy for producing energy dense things like methane and kerosene from the air, and you use them for things like planes, rockets, and as emergency storage for the worst of days. It's an inefficient process, and sure you could use the excess energy for things like desalination or bitcoin.
Hopefully, we're able to make more then we need, and can convert things like co2 into long term stable hydrocarbons and bury them into the ground along with ch4 from the air. That way it would be net negative.
But it is also possible to make a zero emission ICE vehicle, just expensive and complicated. You carry a LOx tank and a hydrocarbon that can be completely combusted. You then only get CO2 and H2O from the combustion. You dump the water. You liquefy the CO2 and store it for future burial, use in industry, or conversion to something long term stable
The US navy has prototypes for aircraft carriers to convert seawater to jet fuel. Their big problem has been finding better catalysts. The current ones are very expensive, hazardous to handle, and break down too quickly. If/ when they solve that problem, they'll be able to use their nuclear reactors to make fuel for their jets and guard ships. They use weapons grade fuel in their reactors, so they run for decades without new fuel, and have very high power and energy densities.