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.
Burying it deep underground instead is likely to impose a high cost of transport as well.
They’re proposing about 10 feet, which isn’t that far.
Agreed. However, burying it ten foot underground in a remote location, sealing it to keep moisture out, and then continuing to monitor it for hundreds of years is not trivial.