From 1920 to 1933 it was illegal to possess alcohol in the US. This solved all of the country’s problems (besides the stock market crash, Great Depression and Dust Bowl)
Why not ban CO2? Anyone caught exhaling CO2 could be summarily executed. This would make the world safe for small fish in California’s Central Valley.

An outright ban on CO2 seems a bit drastic.
Since it is now widely claimed by such peerless entities as the EPA that CO2 is a toxic pollutant and a mortal danger to society, the next step is to regulate second-hand CO2 emissions. Regulations could mimic those used for cigarettes, with glass-enclosed rooms at airports where people could run to exhale, special fart collection air handlers in washrooms to prevent methane releases, or even a personal CO2 sequestration appliance that would look somewhat like an Apollo space suit.
Air tight body bags would do the trick.
We could call them Capture and Storage devices. Like those Vacuum storage bags where all the good air is removed so it will not be polluted by the CO2 being released while breathing out.
I vote for the Chicken Little Brigade to do the testing to see if they are suitable for the purpose.
The left has too many gas bags already.
Better yet, let’s pre-emptively confiscate all the carbon in their bodies in case they might accidentally create some CO2 at some undefined time in the future.
And the phosphourus. Can’t forget how damaging that is to the environment, either.
A human body burns ~2000 kcal energy per day (ballpark). This is equivalent to 1/4 cup of gasoline or heating oil, or less than 3 kw-hours electricity consumption. The point being the CO2 produced by a human body is very small compared to our energy consumption, and insufficient to address the annual imbalance of CO2 in the bio and anthropospheres. It would be much more logical to address the larger sources, which would include fossil fuel consumption.
Of course, given that prohibiting some humans from exhaling CO2 would kill them, that would indirectly reduce their fossil fuel consumption. As a strategy, it would be most logical to start with Australians and Americans, since they are the greatest consumers of energy per capita.