I, for one, think it would be terribly difficult to maintain mines, steel mills, farms, water purification plants, chemical plants, concrete plants, auto factor

I, for one, think it would be terribly difficult to maintain mines, steel mills, farms, water purification plants, chemical plants, concrete plants, auto factories, living quarters, hydroponic farms, plastic plants, glass plants, textile factories, sanitation, and all the other infrastructure we would rely on to maintain a technological existence, in an H2S-poisoned atmosphere with no ozone layer and no end in sight over eon timescales. Technological civilization isn't a balloon or a tower, it's a pyramid. In order for the peak to climb higher, the base levels -- a stable and inexpensive supply of food, air, land, and water -- need to grow as well. Undermine that foundation and you can't expect the upper levels to float.