Given that the OP asked about the pollution coming from a gas powered golf cart, it is interesting to see how far in the weeds this thread has gone.
To the OP - A few people have answered the CO2 question. The other pollutants (NOx, CO, and unburned hydrocarbons) are important as well. On a car, these are significantly reduced by the catalytic converter. While a quick google search turned up some state and national figures, I did not find figures for gasoline engines in golf carts. NIOSH did have a report of a farmer who died after being in an enclosed space for 30 minutes with an 11 HP gasoline engine running. While this is not a quantitative number, it does show that a significant amount of CO was produced. If I can track down some reliable figures for the pollutants in the exhaust of small, 4 stroke engines, I will let you know.
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“There is no such thing as a normal period of history. Normality is a fiction of economic textbooks.”
— Joan Robinson, “Contributions to Modern Economics” (1978)
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