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follow BayAreaObserver 2018 Jan 9, 2:57am
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Many people assume that when you apply salt to the landscape it just gets washed away and disappears.
Fertilizers, ground water usage for irrigation(easily seen in the Central Valley if you fly up and down California, industrial activity, prevailing winds also blow west to east. Look at the definition of what a salt is that was used in the OP.The "warm" areas are largely agricultural and are or used to be industrial.
or even all the waste produced by humans.
Ahhh, there's the problem, stop eating processed foods filled with salt, and all the salt by-products won't be coming out of human waste.