Ultimately you're probably right about there being no demand limit, but I think there is context here. There probably are demand limits on Earth, and demand lim

Ultimately you're probably right about there being no demand limit, but I think there is context here. There probably are demand limits on Earth, and demand limits certainly exist at any point in time. I disagree that without an "artificial" source we are reduced to "collecting it the old fashioned way" unless these are elaborated upon. Do photovoltaic panels count as an artificial source? The fusion reactor is a natural gravitational confinement one, but the collection apparatus is artificial. Of course farming with hand tools is artificial too. Anything but bare hunter gatherer life with virtually no tools is artificial.