We have made huge strides in pollution controls for cars. Smog still exists in LA, but it isn't as bad as it was in the 1960's - and far better than it would be today, if nothing had been done to improve emissions for automobiles. The improvements are not trivial, either - more than a 10:1 decrease in emissions since those "good old days" - and ironically, cars today are better, safer, more reliable, faster, handle better, and have tons more horsepower. These are the good old days.
And this is not to trivialize carbon emissions or global warming - which like the ozone hole, are real things (and many on the Right denied the existence of the ozone hole at the time as well!). It is only to say that it may be possible to fix these things - and many people are taking action in that regard, including China. If China can do it, so can we. Great things may be possible.