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hesperidia comments on [LINK] Climate change and food security - Less Wrong Discussion
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I heard (though I'm not entirely sure how to cite or quantify, so salt as necessary) that the weather patterns that will be inspired by climate change will tend towards extremes: either drier deserts or more damaging monsoons/hurricanes/flooding rains, not "bringing more rain to places that don't get rained on much today".
Historically, warming leads to shrinking deserts, and cold earth eras were also the driest. Some researchers have found that the Sahara is shrinking as the Sahel spreads north (though the Sahel itself is threatened by desertification caused by bad agricultural practices).
In particular, I've heard that too much ice melting, leading to too low seawater salinity, could stop the Gulf Stream, making the climate in Europe much colder.