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Efficiency improvements are what is needed. And what improves that? Well certainly not a paper about impending doom on a linear course. Gee, wouldn't technology to recycle all that wasted water, or better distribution, help growers everywhere? And if there was money to be made in providing these new efficient services, uh... well, I should think that a healthy market with plenty of credit would jump in to produce those technologies. Probably one of the best things you could do to help places that will suffer from these initial crises is to get business going in a profitable manner helping the farmer use water there. Gee, and what do you know, people are already doing this.
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That's all very nice and well, but you are forgetting an essential part of the equation: GROWTH
Even if we could solve all food, water and energy problems -which is obviously unlikely- somewhen we will hit the limits of the earth, if even the physical ones: There will simply be no room for all of us. Take a look at Japan and see what I mean. The average size of a house there is 60 m2, and a whole family has to live there .... now. But what will the size of the average house be when the populations doubles? 30 m2? And when it triples? 15 m2? And later?
It is such a nonesense to keep a pattern that is doomed to fail somewhen in the future -even if our generation or the next one doesn't see it, which is also debatable- that you have to wonder if the humans are really intelligent beings.