There was a time, not so long ago, when worried Israelis would listen out for daily updates on the water level of the Sea of Galilee (or the Kinneret, as it is known in Hebrew).

It’s the country’s only significant freshwater lake and was, until recently, its primary source of water.

So it was a national concern if the level dropped, as it often did during the summer months, day-by-day, centimeter-by-centimeter.

The upper red line (danger), was bad news. The lower red line (pumping from the lake prohibited) was worse, and the black line (risk of permanent damage) was terrible.

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