Why is it that climate-change-people rarely focus on the impact of Space Travel when it comes to green house gasses and the hole in the ozone layer? I asked a guy last night that was "environmentally conscious" to name me the things that he felt were most damaging to the environment and the ozone layer...and he ran through the usual suspects...coal, fossil fuels, SUV's...you get the idea...but he never mentioned Space Travel. Man first started to litterally pierce the ozone layer, and then expose it to mass amounts of exhaust, repeatedly, with a great intensity of intervals in the 1950's. When was the hole in the ozone layer first discovered? What has happened to that hole since? I tried to figure out how many launches there have been since 1950, and I lost track some place around 1958...it was a crazy number...if anyone can post the actual, total number of launches of space vehicles in the history of man, I would appreciate it. Now today, the space shuttle goes up, or a new rocket goes up and we are all like it's a trip to the grocery store. I am not some sort of environmental-wacko with a theory, nor do I think that space travel alone had a greater impact on the climate change and green house gasses than any other factor...just curious if anyone has thoughts on the subject, and if they ever considered that premise before. My apologies if this subject is a re-run, I am new around here.