It’s even worse than those numbers. If you got rid of 100% of CO2 all plants would die, so they really want us to go back to .03% of the atmosphere versus.04%.
So the calculation is It is 0.04%. Of that, only 3% is man made CO2. And of that, Australia produces 1.3%. AND OF THAT only 25@% is above historic norms.
If you got rid of all CO2 we would all die. The O2 half of the equation seems to get overlooked somehow.