Rare metals. I wrote to George about a decade ago Archived Message
Posted by dan on January 12, 2020, 2:06 pm, in reply to "George Monbiot: Lab-grown food will soon destroy farming – and save the planet"
when he was proposing hydrogen as a fuel for all vehicular transport and asked him when peak platinum was happening. He asked me for evidence of the problem which I didn't. However "rare" metals are a finite resource and often but not necessarily rare, but his proposal relied on every vehicle on earth using them as well as now all food. Reality requires us to use less, much less, and be happier without which I think probably follows.
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