Still inventing

To anyone who actually might find their way here, I have not stopped inventing, I am just not inventing stuff that I can post here. Either because it is in my field of expertise, or isn’t the kind of thing you post to the net. Basically I don’t post things that could help people I am not wild about, be they terrorist states or the competitors of my employer. You know who you are!
However, I did find a source of calcium that doesn’t directly require the release of CO2 from limestone: bone a.k.a. hydroxyapatite.
Now what would be cool would be a roofing material that could neutralize the carbonic or sulfuric acid in rain, or whenever it was damp, and convert it to insoluble Calcium Carbonate or Calcium Sulfate. This would renew the UV barrier of the roof and remove greenhouse gas and acid rain. The cool part is that a quick spray of CaOH could renew the ability of the roof to precipitate more.
While we are making cool roofing material it would nice if the roof material could remove ozone and NOx, even if was a terribly inefficient catalyst the thousands of square miles of roofing in the US could really make a difference.