"But researchers say what's good for ozone is bad for climate change. In the atmosphere, these replacement chemicals [replacements for CFCs] act like "super" greenhouse gases, with a heat-trapping power that can be 4,470 times that of carbon dioxide."
Havent't heard of this before...
Nice idea, but is it really new: resistance of cyanob. to UV radiation has been known but studies have been inconclusive as to under what resource limitations it works, but according to what we see from evolution: on Earth it works, since they survived pre-ozone atmosphere!
some papers from a quick google search:
1999 http://www.tandfonline.com/doi/pdf/10.1080/09670269910001736392
2014 https://www.ncbi.nlm.nih.gov/pubmed/25463663