That's what I get for only reading the comment. That changes it to ~5.9e-3 m^3 per set of truck nuts, which is 5.9L per set. Still a little large for most people, I think.
Ten million aircraft carriers would weigh about 590 trillion kg at the low end, so the truck nuts would have to be 580 billion m^3. I'm not sure even Texans use sets that size.
I tried a pair of earbuds with the same idea from AliExpress. They had the regular controls, but also worked as e.g. a camera remote. Very cool if it had done anything it was supposed to do consistently, but unfortunately it was not well-implemented. If the AirPods Pro 3 (which I was already strongly considering) have a case with a screen that isn't much larger than the Pro 2 case, I'll probably buy that model.
You could also be even more cautious: "I noticed that they cheer you up, so I try to have them on hand for when you're feeling down." No mention of conditioning, wholesome, hard to argue against.
OLED also matters more on phones because such a large fraction of their power use goes to the display (apparently up to 80% at max brightness on a task that doesn't require much computing power). A desktop would need one hell of a multi-monitor setup to get remotely close, plus you aren't as concerned about power usage when there's no battery to deplete.
People have tried to politely call attention to the climate crisis for decades. They were ignored. Sometimes, you have to be chaotic to get noticed. See also: Stonewall, the Black Panthers.
Thunberg's solution has always been "listen to the experts who have been screaming at you for 50 years." You don't have to be an expert to care about things or to want to listen to people who are experts.
Republicans will talk about it, but they blame it on anyone who doesn't have power.