Will we ever learn ? On a smaller scale, the Tagus-Segura water transfer project [0] in Spain is creating problems not only for Portugal who receives less water in the Tejo river, but also fueling unsustainable agriculture booms which in turn have created ecological disasters [1]

Often these water transfers introduce invasive species.

[0] https://en.wikipedia.org/wiki/Tagus-Segura_Water_Transfer

[1] https://inspain.news/mar-menor-is-victim-of-water-diversion-...

(THE TAGUS-SEGURA WATER TRANSFER Lessons from the past (pdf))

[2] http://d2ouvy59p0dg6k.cloudfront.net/downloads/tagusseguratr...