CronoDAS comments on You're Entitled to Arguments, But Not (That Particular) Proof - Less Wrong
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Ok, icy wastelands I can see. But the deserts and arid regions? Our deserts here in Australia seem to have more than enough heat already. And the most fertile land is that which is right near the coast, ready to be covered in salty water as the ice melts. Then all we would have left is desert.
According to Jared Diamond's book Collapse, Australia's biggest agriculture problem is a lack of good topsoil; you really can't farm it very well because if you don't return the nutrients from the plants to the soil by not harvesting, you end up unable to grow much of anything at all a year later.