I'm glad to see research into this. Sand for concrete is a specific type of sand (nice and bumpy so it likes to lock together like a jigsaw puzzle) and people get killed by what are basically sand cartels. This was the "legitimate" mob business in the last season of Barry.

Portland cement is about 2/5 sand, so we'll need to start drinking more coffee! I was glad to see they're testing other organic matter since coffee is very susceptible to climate change, ironically caused in a large part by cement production. Unless you believe the reader comment on the article begging people to realize climate change is a hoax...