Well some of those resources at least can be recycled, even if that's more difficult than mining. But yeah, they're not going to have all the convenient fossil fuels we do. Oh well, I guess we'll have to tack on an addition 10k or 20k years.

Well if you're going to use that argument, by the same logic, *every* diode passes current in both directions, and there's no such thing as a diode that blocks current in any direction, which renders the original statement nonsensical.

A correctly-operating diode only blocks current when reverse voltage is lower than the breakdown voltage. There are diodes which block current in both directions in this state.

A diode that blocks current in both directions is defective.

Absolutely wrong.

There's TVS protection diodes that use the avalanche effect which do exactly this.

so that we can focus on bigger problems, like keeping planet Earth habitable in the latter half of the 21st century and the 22nd century. Unless this is done, humanity is very unlikely to experience a 23rd century.

Oh, don't be ridiculous. Humanity will surely live to experience the 23rd century. It's really hard to completely wipe out a whole species with this many members, and which has intelligence and technological capability.

Now, of course, the 23rd century will probably look a lot like "Max Max II: The Road Warrior" or "28 Days Later" or "The Walking Dead", but I'm sure there'll be at least a few humans still running around.

Don't worry; humanity has had setbacks before, and recovered from them. The Roman Empire fell, for instance, causing Europeans to live in darkness and squalor for 1000 years before the Renaissance. So we'll probably have to wait until the 33rd century before we build a base on the Moon or Mars, but we'll get there eventually, after conquering the zombies and rediscovering antibiotics.