The Scientific American article is a few months old, but I heard an interview with the President of Purdue U (former Indiana governor) who wrote an oped in the Washington Post about this study recently. It seems like it should at least be worth a look. The basic idea is to set up wind and solar farms along the border, with some agricultural and business zones as well. Some of the generated power would be used to desalinate water from the Pacific and the Gulf to be used for some of the industry and agriculture. Parts of the security would be managed by the private industry security set up. I'm not saying it would definitely work, but it is something to investigate. That reduces the burden of BP agents, adds infrastructure and jobs on both sides of the border, and this might be a wall that Mexico would help finance given the added industrial and agricultural base for them. I skipped the oped, but the link is for the SA article.
https://blogs.scientificamerican.co...he-border-wall-with-an-energy-water-corridor/
https://blogs.scientificamerican.co...he-border-wall-with-an-energy-water-corridor/