before even monochrome television was invented; it meant wanting new possessions in order to show off to the neighbours. That we had now reached the physical limit of conspicuous consumption could be proved, said my colleague, by analysing the resource constraints scientifically. The cathode-ray tubes in colour televisions depended on the element europium to make the red phosphors on the screen. Europium is one of the rarest elements on Earth. The planet’s total known reserves were only enough to build a few hundred million more colour televisions. After that, it would be back to monochrome.
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