This is called presenting facts not in evidence.
If CO2 is THAT powerful, please, Please, PLEASE show one lab experiment where the control tank has 250PPM CO2 and the test tanks have 500, 1,000 and 3,000PPM CO2 and test for temperature
Mythbusters tried it, but they not only had to use 7,000PPM CO2 they added an ice sculpture melting in the control tank. Water vapor being a far more powerful GHG than the Almighty CO2.
If it worked as posited, we'd see literally millions of successful experiments billions of times a day to get us to cut back our carbon footprint.