I think the other comment is probably more pertinent to what you were asking, but it's also interesting to note that geothermal heat comes from decaying radioactive isotopes and tidal heating. Both of these also reduce over time, as isotopes decay into more stable ones and orbits circularize, so these sources will also be "used up" too, but on geological time scales

My guess is that everyone involved, from these guys to the taqueria operators to their customers are all in poverty and just trying to scrape by with limited options and opportunities

Yeah, everyone with a different political view than me must be ok with slaughtering street dogs and selling their meat under false pretenses, because they are bad and I'm good

I have a LOT of good ideas where the only downside is the cost to implement it. Here are a few: Moon prison colony. Free organ cloning. High speed trains between every sizable city. Resurrecting wooly rhinos and giant sloths for their wool and high quality protein.

I thought that water was useful because it allows you to obtain H and O separately by electrolysis, then combine them for a powerful chemical reaction. Maybe that's what they're doing here and just not being clear about it. The way it's described it sounds like they're just heating up and expelling gaseous water which doesn't make a lot of sense to me, though I'm not an actual rocket scientist

I think you're reading too much into this, it seems clear they're talking about a pattern of behavior related to his reporting

The most recent common ancestor (MRCA) of any two extant species today are all dead. The theory of common descent says there was a MRCA of any two living organisms today, so the question is just what can we say about that MRCA, and with what level of confidence.

If we find a fossil that looks like a good candidate for the the MRCA, then we can use various radioactive dating methods or existing knowledge about the layer or environment it was found in to help estimate it's age.

The DNA method you're referring to works roughly by taking an estimate of how quickly mutations happen, seeing how different the DNA between the extant species is, and dividing the amount of change by the estimated rate of change to estimate a divergence date.

However, at the end of the day you're right, these are the best estimates we can come up with, and there is certainly a margin of error that's bigger or smaller based on the amount of info we have to work with.

The implication is even stronger on a submarine