Quote Originally Posted by Sigurd View Post
Acidic rain is necessary to produce calcium-rich clay by erosion which runs into the ocean via rivers and makes e.g. the important building blocks for shell-fish, housing for snails and least but not last coral. The calcium depended creatures eventually die and make limestone which is in fact trapped CO2 in the ocean. The cliffs of Dover is a great example of this - once an ocean bed. Environmental regulation will never stop acidic rain, if it did - it would destroy important ecological circuits.
Are you deliberately equivocating? Normal rain is lightly acidic at pH 5.5 or 6 (like milk or coffee) due to condensation around the cloud nucleus and reaction with atmospheric carbon dioxide.

More acidic rain than that will disrupt the cycle you mention and contribute to aquatic osteoporosis.