> There's no way that a tidal plant running for 100 years is going to change the day by 1 second. You're many orders of magnitudes off. It was a recollection o

> There's no way that a tidal plant running for 100 years is going to change the day by 1 second. You're many orders of magnitudes off. It was a recollection of a problem from 25 years ago for crying out loud. Thinking about it some more, it's probably slowing down the rotation of the earth by 1 second over the course of 100 years. Not 1 second per day. Which makes about 4-5 orders of magnitude difference. > I didn't check your molten rock calculation but given how off your tidal plant calculation is I wouldn't be surprised if it's way off as well. The point was to get a "back of the envelope" calculation. Not to get a precise answer to 4 decimal places. What's with the bike shedding? Is the point here to have a discussion, or to prove that you're smarter than everyone else?