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Comment Re:Paul Ehrlich? (Score 0) 294

carrying capacity of the earth is at least 15 perhaps 20 billion

No it isn't. It's just not possible to sustain our current world population and living standard without oil.

Israel seems to manage fine (though not without trouble and ingenuity)

Yes! Israel just takes all the water it wants, and leaves droplets to occupied Palestinian territories. How ingenious!

Comment Re:Does it matter? (Score 1) 294

Urban people have a smaller ecological footprint

Citation needed.
There's an ecological optimum somewhere between a hamlet and a megalopolis. If you live in a remote place, you need to take the car for many basic needs. If you live in a huge city, you need to import all your food, and export all your waste.

Comment Re:Infinity (Score 1) 1067

You're both correct for X divided by zero. It's simply not defined.

But GP was right for "Y plus red" and "Z times pineapple".
Both are defined in a mathematical sense :
* If Y is an integer, "Y+red" is defined in the free abelian group on the generator {1,red}.
* My math is rusty, but "Z times pineapple" should be defined in a multi-variable polynomial ring.
You don't need physics to define any of them. You can draw parallel to physical units, but you don't need to.

Finally, you're free to think that math is a human invention. My personal feeling is that we discover math more than we invent it, but I guess we'll never know for sure.

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