Starting from a smaller base is always a larger percentage increase for comparable absolute magnitude changes. From 1 to 2 is a 100% increase while from 20 to

Starting from a smaller base is always a larger percentage increase for comparable absolute magnitude changes. From 1 to 2 is a 100% increase while from 20 to 21 is a 5% increase. The concentration of salt in the Ocean is roughly 4% while the concentration of CO2 in air is about 0.4% (400 ppm)...