Coffee grounds make concrete 30% stronger
So after the teams pyrolysis step, this is really just carbon dust they're adding to the concrete.I'm all for locking carbon away in solid objects, and this seems like a good way.   One might imagine a law that says "all new cement products must be at least 20% carbon by weight, or pay a $1000/ton tax for missing carbon".That incentivises locking up carbon in structures, in a form unlikely to escape anytime soon, and gives a proportional fee for anyone who doesn't wish to do so (for example, concrete for very specialist purposes).