Quoting Marc Garneau

This is a note that Marc Garneau sent me when he was still president of the Canada Space Agency:

Michael:

Thank you for your note. I see some problems with your proposal although I applaud your desire to help with the serious problem of ozone layer thinning. Ozone at ground level is of course an undesirable gas. It is often reported as part of air quality programs. High levels, due mainly to car exhaust emissions are considered undesirable. The best place for ozone is indeed way above our heads but it's not obvious how to get it there and the sheer amount that is needed to replenish the atmosphere is probably mind-boggling. What I am saying is that pumping it back into the atmosphere, assuming one could release it at the right altitude would probably be but a drop in the bucket.

Thank you for your suggestion. Best wishes,

Marc.