Look it up. It's not hard to find several sources that explain that CO2 is appox 4 -5% or 400 ppm. I think it may be at 417 ppm or so they claim. As far as water vapor goes you'll have a harder time finding information of water vapor and it's reflective properties as it pertains to the so-called "greenhouse effect". Water vapor is purposely excluded from the national conversation because it puts the whole climate change scare into a clearer perspective. Adding water vapor and clouds into the equation further lessens the fear of climate change because it reveals other factors that play an even bigger role in the natural warming cycle of the earth.
It's convenient for the climate change proponents to exclude certain realities to push this scare into peoples minds. Water vapor is a tricky greenhouse gas because it's range for fluctuation is so broad. Arid areas have close to zero water vapor while tropical climate can have as much as 100%.
This pie chart was only meant to demonstrate how approx 5% of CO2 can when compared to the amount of water vapor possible in the atmosphere makes CO2 (especially man-made CO2) incredibly minuscule by comparison.
It's worth noting: Water vapor typically contributes about 60% of heat trapping, clouds about 25% and CO2 about 20%. Man-made CO2 is only a small fraction of the total CO2 added in. Knowing this and the fact that the planet is known for making adjustments to counter any changes to the environment can put many minds at ease.
