The article they link about pyrolysis is worth a read too. The main source of CO2 emissions from cement production is cooking down limestone into lime IIRC. I was curious how much energy is used to turn the biomass into the end product and what waste is generated. It's a bit too detailed for me to understand, but the process ends up with 15-25% biochar (the stuff they're promoting in this article), some potentially useful byproducts, and some regular combustion pollution.

I worked on some undergrad research examining the potential to use spent coffee grounds for biodiesel. SCG has residual oil that can be extracted and refined. I wonder if this could be combined with biochar, getting multiple commodities from a waste product.

I guess this means I'll need yet another, different colored wastebin just for coffee now. I mean I'll do it if it helps, but I can only fit so many receptacles in my kitchen. Meh, I'll just put the rest in the twins' room.

And I've already reported it as misinformation. Nice when a website lets you report stuff without having an account.

Quick point of clarification - concrete is about 40% sand. PortlandPortland cement is one of the other parts of concrete - it’s what actually holds concrete together. Other pozzolons, like fly ash, can make up 25-50% of the cementitious material.

FWIW, Cement is wildly energy intensive to create and produces a huge amount of CO2. We don’t have a lot of replacement options for cement (or concrete generally) because of its unique durability.

"so we’ll need to start drinking more coffee!"

I volunteer ☕

I'm an engineer and I run on decaf coffee. There's no such thing as good decaf coffee. I'm also not a very good engineer.

I totally agree