whoops. i discovered the azolla fern needs fresh water and i didn't realise the arctic ocean was trapped between land masses and so not salty during the azolla event.
but it's this kind of biological break that earth needs. a plant that really, really likes the taste of carbon dioxide.
how about cutting down the pine forests and taking the wood to a facility that incinerates them without releasing any carbon to the atmosphere?
new forests would incrementally remove carbon from the atmosphere.