That's the entire point.
You can't reduce CO2 by legislation, at least not in any reasonable time frame. The environmentalists have finally smacked up against raw thermodynamics.
You have to either rapidly reduce the overall energy used, i.e. reduce our industrial and motive output, or switch to heavy-duty non-hydrocarbon energy sources.
The former, of course, will be the recommended route. The reasons for that start to ease into that old ideology stuff again, so I'll leave it there.