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Desert farming , responsible education on overpopulation that We have not got from our ruling class elites .. The population was 4 billion when I was born , it is now 8 billion.. No time in the last 4,000 yrs has that many people lived on the planet at the same time. Look at Google Earth and look at them squares.. Not too many people TOO MUCH FARMLAND .. yet we have the tech to green and farm parts of our vast deserts .. They actually do this in Saudi Arabia but barely in the USA .. Deserts are full sun .. the water is an issue, but We have the tech ..