Graphyte, a new company incubated by Bill Gates’s investment group Breakthrough Energy Ventures, announced Monday that it has created a method for turning bits of wood chips and rice hulls into low-cost, dehydrated chunks of plant matter. Those blocks of carbon-laden plant matter — which look a bit like shoe-box sized Lego blocks — can then be buried deep underground for hundreds of years.
Sounds like the blocks are sealed to stop decomposition… so I guess the bricks would rot if the seal is compromised? That wouldn’t be good for a building. And it would let the carbon out.