[Flakbadger]

I don't understand why we don't push to make more sewage treatment plants into carbon sequestration areas. I understand that a lot of sewage needs treatment with things like anaerobic digesters, but if a large portion of partially-treated water was then put into large shallow lakes and filled up with things like duckweed or azolla, it would remove basically all contaminants from the water (INCLUDING MERCURY!).

Especially azolla, which can continue to grow in thick mats. As far as I understand it, that's what caused the last ice age, was all the carbon it sequestered. Anyway if we converted a modest amount of sewage plants that had the acreage to put some plants in there...

And maybe a dream, but cattails make excellent sources of ethanol, WAY more than corn. And you can fertilize them with the same (literal) s*** that you fertilize the azolla with.