I don't even have a witty or insightful comment to add to this. I'm just going to let the article itself do the talking. 

Spent coffee grounds (SCG) are the most wasteful byproduct of the entire coffee industry. By one estimate, 60 million pounds of the stuff ends up in landfills around the world. If that wasn’t bad enough, as organic material decomposes, it gives off methane and carbon dioxide—two no good, very bad gasses that are driving climate change.

Every year, concrete used in construction projects relies on extracting 55 billion tons of natural sand as the particulate’s rough exterior provides more surface area for water and cement to bind. Sadly, this sand is often sourced from river beds and banks, which disrupts the natural environment. So, replacing sand with spent coffee grounds could solve two ecological problems at once, since SCG are similarly fine particles.