[rubyfan]

Seems hard to put a price on some of those negative externalities. A tariff or something doesn’t really fix or curb the problem.

[vkou]

It's pretty easy, just charge ruinous usage rates for any water use that is beyond replenishment rates.

It doesn't matter if these soybeans are going to China, Mars, or Washington state, the only thing that matters is whether the people growing them are exhausting their region's water supply.

[silon42]

Has the tariff been tried? Increase it if the aquifer levels are dropping.