Mostly that. But realistically there&#x27;s no education on any of this stuff.<p>For example 2017 is the year when some of the most used rare earth elements will be depleted and should be retrieved through recycling in the next years (gallium for the LCD displays is disappearing, so either we figure out the displays or massively recycle). This is not a surprise because the demand for rare earth elements has been rising exponentially, with the number of electronic devices produced :D<p>Although, food production is definitely getting more and more efficient. But biology of living beings on Earth is too inefficient for the current production to be sustainable. Just compare the vast amounts of food (energy) a single duck, chicken or cow needs to maintain body heat, with the weight (energy value) of meat. This coupled with growing consumption in developing countries won&#x27;t really work.<p>Without Hot Air is an excellent book written by a problem solving pragmatist and excellent machine learning researcher David MacKay exposing the pure numbers and limits and extrapolating them carefully, to get the same conclusions.
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