In simpler terms. CO2 makes up 0.036% of the atmmosphere, or about 1/27th of 1%.
Here’s a simple way to look at it....
Imagine all of the earth’s atmosphere fits into a box that is 1 mile square. That is 1 mile wide, 1 mile deep and 1 mile high.
ALL (naturally occuring and man-made) of the CO2 in the atmosphere would be in a box that is only 190 feet square.
BUT, all of the man-made CO2 would be in a box that is only 9 1/2 feet square.
So, you have a box that is 5280 feet square (high, wide and deep). Inside that box, the BAAAAAD, man-made CO2 is a box that is 9.5 feet square.
Now, let’s go to the absurd and make a 25% reduction in man-made CO2. You cut the box from a 9.5 square box to a 7.125 foot square box.
Still don’t see it?
Try getting a 1 foot ruler and imagine a 1 square foot box representing all of the earth’s atmosphere. The man-made CO2 would fit into a box that would be hidden by the dot between these parentheses(.).
Now, try reducing that by 25%.