Nothing is simple. If Mexico City is to have safe water, then the national parks have to be kept free of cattle… which spells disaster for small farmers. Franc Contreras reports for Al Jazeera:
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The background of Mexican anti-clericalism and the "atheist" general who led the Catholic counter-revolution of the 1920s 128 pp., Editorial Mazatlán, 2012.
An oral history of the World War II experiences of Gilberto Bosques (1894 – 1997), Mexico 's Consul General in Marseilles, France, who saved tens of thousands from the Nazis. 36 pp. Editorial Mazatlán, 2007 $35 MXP (click the image)
The Mex Files 
In may I was in Madera, Chihuahua speaking with members of the ejido there that have agreed to curtail grazing and logging and to let ecotourism have a go. We saw that some of the streams were making some recovery after years of grazing caused erosion, but the ecotourism is not as successful as the various universities told them it would be, and I think we’re headed for full decline.
As the lake beds are drained for ag (see Babicora), the Mennonites strip the water tables, and as ejidos abuse stream beds, Northern Mexico is heading for the same sort of water crisis that Central Mexico is headed for.