Not sure of the cholesterol claim there, but here's some numbers on CO2;
Currently @400 ppm = Parts Per Million.
Expressed as a fraction 400/1,000,000
Fraction reduced per method one should have learned in K-12;
1/2,500
The unproven hypothesis of ACC/AGW is that if the other 2,499 parts of nitrogen, oxygen, argon, etc. are at 70 degrees F, and one introduces the one part CO2 at 75 degrees F into that 2,499, then that 2,499 will increase in temperature by another degree or three.
Does this make logic and realistic sense to you?