Ps. But you are right about O3. It's a pretty unstable compound that is rather rare in natural occurrences, and has a short lifespan (I think something like 20 days before it breaks up into O2 and evaporates at room temperature). Even so it is produced in some areas with high enough concentrations to pose health problems to humans just by going outside and breathing the air.
It seems painfully obvious that the conditions of the Earth were formed over billions of years so that we have a pretty well balanced chemical system. The only naturally occurring geologic phenomenon that changes them drastically are volcanic eruptions... So when humans engineer chemical reactions that would not have otherwise happened in such a time, such as burning billions of tons of carbon to produce billions of tons of CO2, or generating electro-magnetic waves that stimulate the production of O3 ozone , it will obviously fuck things up. How can anyone honestly believe that changing the chemical system on one level is not going to effect it on any other level? that is sheer scientific ignorance.