Ignorance is bliss.
Acid rain is still a problem but it isn't in the news as much. It has gotten a good deal less severe, in many places, though.
Because things got better a fraud was involved? Do you think there might be any alternative explanations?
Like a switch from intensive coal fired energy generation, regulatory controls on industrial polution, etc. (Or another way of putting it: the things that your dogma-brethren claimed were supposed to ruin the economy were put in place and they worked but they didn't ruin the economy.)