Why is it so difficult to make water drinkable from the salty oceans?
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It’s not difficult per se, it’s just very expensive, both in terms of money and in terms of energy used, especially if you intend to do it on a large scale. Countries wealthy enough to afford mass-desalination usually also have other sources of water available, like reservoirs, lakes and whatnot. Countries that don’t have other sources of water, for example those in desert climates, usually aren’t wealthy enough to afford mass-desalination. There are a few exceptions, if you look up mass desalination plants you’ll find they mostly occur in countries that are wealthy _and_ desert-like, like Saudi Arabia and the UAE.
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