Isn't the carbon already locked away in the coffee grounds? Why spend energy and hence more CO2 emissions on charring the grounds?

Because coffee grounds would actually make terrible aggregate, as complex organic and formerly alive compounds, there's a lot of potential for weird chemical breakdown that could harm the concrete or anything else in the concrete.

Char is pretty chemically stable, because carbon is very chemically stable.

The coffee grounds are biodegradable, and that process causes CO2 and methane to be released.

Just to clarify, methane is only released if it biodegraded by anaerobic bacteria, if it's biodegraded by aerobic bacteria it only produces CO2.

We could carbonize the biomass then cram it in a landfill and... wait that's just reburying charcoal.

My vote is for sequestering carbon as an ever-growing mountain range of diamonds.

Where are the grounds going to be stored?

He said smell not taste! At least I hope he wasn't tasting the lab samples.

Just the semen.

“Lab samples”

Are post WW2 borders sacred? Is Crimea, transferred by Soviet Russia to the Ukraine in 1954, sacred? It's called international law. Yes it should be sacred. Nothing you say justifies by any means Putin's aggression and war crimes. Putin is a thug. He is a mob boss. Ukraine will join the EU. Ukraine will join NATA. Ukraine's economy and culture will flourish while Russia will be a pariah until Putin dies of old age and a respectable and honourable leader takes his place.