Forests and carbon capture

[Black Aeronaut]

I know tropical forests are absolutely terrible for carbon fixing. Between the high temperatures and humidity any detritus rots completely, building up no soil and fixing no carbon long term.

You want to fix carbon long term? Your best bets are temperate forests, marshes and peat bogs. Anything that builds up soil.

Or... if you are willing to put some work into it? Chop down a good chunk of the taiga forest belts. Charcoal it and then pulverize it to a powder. Dig an absolutely humongous hole as deep as possible. Drop in all the charcoal powder until the hole's only a 100 meters deep, then plug it. The weight of the powder and its small size will handle most of the tamping down of the charcoal for maximum density and minimum volume.

Now just let the forests regrow. It'll take about 100 years and fix carbon down.

You can also do this with other forests. What you want is maximum weight of wood growth for whatever trees you chop, as that would get the most carbon out of the atmosphere.

Actually, that charcoal powder of yours can probably be used as an ingredient for cement. I know that right now they use powdered coal to do the job - at the cement plant I worked at, there was a coal bunker and a machine to pulverise it and add that to the cement mixture after it had been through the kiln.