Fossil fuel burniing gives off a lot of unwanted CO2 emissions. Why not harness it to turn turbines of its own rather than dumping it into the atmosphere?
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It would still be pumped into the atmosphere. That stuff doesn’t go away when you put it through a turbine. It also isn’t released at a high enough pressure to run a turbine with any significant output.
and what are you gonna do it after it turned the turbine?
Turning the turbine does not destroy the gas, it just loses pressure and/or temperature.
If you mean to use the air pressure of exhaust to turn a turbine on the end of an engine exhaust pipe that won’t work. Putting a strain on free exhaust flow throttles the engine and slows it down. No energy would be created it would be a negative balance
thats called a turbo
on combustion engines the exhaust gas flows through a series of fan blades that turn(usually mechanically) other fan blades that feed more air to the engine. this tends to improve the efficiency of the engine but the exhaust gas must still escape to lower pressure to turn the turbo. so the co2 still escapes. converting co2 back into burnable fuel such as gas or sugars is something currently only plants can do efficiently via photosynthesis(using solar energy to break oxygen from carbon , adding water and making sugars.
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