Yes, ozone, the thing that protects us from the sun and a major factor in global warming considering without it, the sun would melt the polar ice caps drowning every man and woman on earth. Don't worry tho, we will be burnt to a crisp by UV rays before the water even reaches us. We kinda need it to survive.
Show me the science that says the creation of cities had no impact whatsoever on the gaping holes in our ozone. Here's some science for you, 90% of the oxygen that the ozone gets right now comes from the rainforests that make up 17% percent of the world. -Planet Earth. Does that make it a bit easier to grasp the impact of trees on our environment? Now imagine if 50%, 60%, or even 80% of the world were able to provide oxygen to the ozone. It would at least buy us some time until we find a new planet or completely change society by pulling a 180 and getting rid of a lot of everyday normalcies.