We can create it but what is created will not last long enough for us to transport it to the stratosphere. Ozone in the stratosphere is created as the energy of sunlight breaks down the O 2 molecules. The single O atoms then combine with O 2 to make O 3 . Interestingly enough, human beings do 'manufacture' ozone. This 'low level' ozone is a component of smog, and it is created as nitrogen-oxygen compounds from burning gasoline mix with the atmosphere.
Ozone is hazardous as it can cause lung damage when it is breathed in.
Yes, by changing the composition and thus the temperature of the atmosphere. This would change atmosphere circulation and that in turn would affect ocean currents.