Yes, since a Earth day is 86.4 ks, then you can do it at a walking pace of 83 / 86.4 ~ 1 m/s, which is slower than average (1.4 m/s). But in practice you'll wanna sleep, so maybe two Earth days is better than one. Note that regarding oxygen, bottles could be laid out in advance similar to an Everest climb on Earth, and there could be a half-way camper for sleeping.

Step 1 requires real intelligence. That's the trick. You need a system that can actually infer and reason, so that it can be "trained" with an amount of data not too different from that needed to train a dog.

It's a simpler method than trying to actually move the power up and down directly.

Remember, heating elements work by Joule heating. Thus, they satisfy the law P = V^2/R, meaning that the power is proportional to voltage (V) squared, and inversely to resistance (R) (to rough order because technically R depends on temperature T). To modulate the power high to low in the way you're thinking, you have to decrease the voltage. Now given such things are powered by AC, that's not super hard - just use a transformer - but having a transformer in the appliance (and an adjustable one at that) still adds weight and complexity, and thus cost.

But here's the thing. Thanks to thermal inertia, if you instead subject the heating element to an intermittent/pulsed power input, then so long as the pulsing interval is not too large, it will heat up as though it were being subject to a continuous input of heat at a fraction of the maximum power equal to the duty cycle fraction, i.e. how long each pulse lasts versus the total time between pulses. That is to say, the heat capacity of the heating element causes it to act thermally like a low-pass filter, so the temperature response looks like a greatly smoothed version of the power input waveform. Hence if it stays on 30% of the time and is off 70%, e.g. a 0.3 s pulse followed by 0.7 s of off time, then the heating element will act like it is receiving a steady 30% of the input power (or if you like, sqrt(0.30) ~ 55% of the input voltage), with no transformer required, just a switch (maybe a transistor, but still, it's a switch). And switches (incl. transistors) are cheap and easy to make and use.

If one's going to "preserve" humanity by this approach, why not re-wire its genetics and/or brains so it doesn't work that way the "second time around"? That'd seem to deal with that problem fairly easily.

Sure, but why must all "working toward goals" be driven by another, imposed, need - especially one that's going to ruin the ecosystems we depend on so thoroughly? Is it worth the "psychological" benefit if the alternative is a whole planet turned to a toxic hellscape?

Will that assumption actually hold, though? What will prevent any one from outcompeting the rest and its controllers thus monopolizing power?

The thermally-generated (incandescent) light from the Sun is pretty much white noise, I believe, if you had an antenna ~500 nm in size to translate it in the same way we translate "regular" radio waves to sound. That's about as "complicated" as a waveform gets.

(Note that such an antenna, and suitable tuner and carrier elimination, is easily manufacturable with modern chipmaking technology. Just that there is no non-fun, economically-justifying, reason to build it, particularly the latter two parts - I believe such nano-antennas have already been tried for other purposes. [On the other hand, maybe someone like MrBeast or other mega YT influencer could fund it FOR fun!])

You don't have to get rid of greed absolutely, just nudge the ratio of greed and moderation.

So then why not just make it so a diagnosis of autism confirmed for that candidate counterbalances the test? Also, because of the manipulative nature of NMP, usually you don't give someone you suspect of having it the trst for them to fill out. A professional would observe them and fill it out.

Where to get the testers from? Draw them at random from the qualified ones in general practice during each election year. Can't be worse than our "every dumb Tom and Harry votes" system - at least these people are likely a bit smarter.

We need to rewire our motivational system so that long term collective risk feels as visceral as short term personal risk. Or where the prospect of long term collective advantage actually emboldens us toward short term personal suffering.

Or hot fusion - hot fusion is quite likely with sufficient further development. If we collapse as a civilization that won't happen of course.

Nuclear needs to be on the table. It needs to be treated with due diligence, of course, but so does everything else. That's not reason to keep it categorically off the table. It is funny because if you asked me this 16 years ago I would have been talking a lot of raving anti-nuke nonsense.