I was reading 20 Forecasts of the World Futurist Society.

Forecast #2:
Water Becomes the New Oil—Water desalination may soon become one of the world’s largest industries. By 2040, at least 3.5 billion people will run short of water—almost 10 times as many as in 1995. The huge demand, plus new more efficient desalination technologies, will create enormous profit opportunities and bring new life to arid regions.

During my recent visit to Patagonia I was struck by barren wilderness for miles together. If we have new efficient technologies for desalination, areas like Patagonia can thrive. If you want to make a long term 30 years real estate play, maybe the barren, wide stretches of land are the play !!