There is virtually no CO2 in the atmosphere.
4/100ths of a percent is awfully close to zero. That tiny fraction of this benign natural gas is not likely to have an "impact" on anything.
By contrast, Nitrogen is 78%, and Oxygen is 21% (that's 99%)
Good points there. CO2 only absorbs a very slight sliver of the infrared spectrum, and today the infrared light that it can absorb is very close to 100% absorbed within 300 meters of the earth. Adding more CO2 won’t have any significant impact on climate. Man-made climate change caused by fossil fuels is just tribal mythology of democrats and other left-wingers.