In a future (100, 500, and 1000 years in the future specifically) where industrial and domestic pollution is totally unregulated, what does the composition of the atmosphere look like? And what do weather systems look like? I know this is an extremely broad question, I'm just looking for a few thoughts from folks smarter than I am. I'm wondering what kind of protection humans would need in this future. Is the main issue still CO2 and global warming? What about particulate pollutants? At what point does it become unsafe to fly because of density of smog? Based on my limited knowledge I don't think even an extreme greenhouse gas effect future would be quite like Venus because of our more limited volcanic activity. So what does it look like? I recently read that Aerosols were actually holding off some of the effects of global warming by reflecting some of the suns energy and now that we have reduced them we're feeling a more extreme increase in temperature and that got me thinking about these questions. What does unregulated, polluted future look like? And specifically, what pollutants would more likely be in the atmosphere in larger quantities?