On the flip side, the world found out there was a big hole developing in the ozone layer, determined that it was a Bad Thing™, figured out the cause, and came together to reverse it for the betterment of humanity. Raising awareness of the problems with CFCs was a big part of that. Did each individual with a can of hair spray or a freon-based air conditioner have to make the conscious choice to select different products? No, but public sentiment and market pressure eventually became overwhelming and global accord was realized. (greatly simplified for brevity).
On the flip side, the world found out there was a big hole developing in the ozone layer, determined that it was a Bad Thing™, figured out the cause, and came together to reverse it for the betterment of humanity. Raising awareness of the problems with CFCs was a big part of that. Did each individual with a can of hair spray or a freon-based air conditioner have to make the conscious choice to select different products? No, but public sentiment and market pressure eventually became overwhelming and global accord was realized. (greatly simplified for brevity).