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I have no idea. I would be apprehensive about major changes to the Earth's atmosphere over relatively short time period, because sometimes we only find out things are harmful much later, after harm has been done (I remember that Marie Curie has been carrying radioactive material around in her pockets, for example). I think we don't really know the answers to these questions. I'd rather err on the side of caution.

I would prefer to see real research into this though, where opinions and evidence from all sides is taken seriously.