To support 8 billion through hunting and foraging we would need 8,000 to 800,000 million km2 of viable land. That’s 100 to 10,000 times the amount of land we have on Earth. That’s also ignoring the inconvenient reality that we’d wipe out all mammals along the way. What about pastoralism? Small communities that rely on livestock? That is not much better than the most productive foraging societies. We’d need around 3,000 to 8,000 million km2. Or 10 Earths.
