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The EPA was already attempting to force us away from coal. That is how technologically feasible it is. Fortunately the courts shut thst down. But the economic impact would be tough. I do not see any hints of a coal shortage. If that happened we would be hurting, but I'd wager on a petroleum shortage first. Coal even gets the added bonus of being available in in politically stable regions, so pipeline shortages aren't even an issue.
I can't at any point that says it is not technologically achievable, I admit that could be done within a decade. I also admit there is no shortage but only under certain circumstances. At the moment only about 2.5 billion of the population has ready availability to electricity on demand, the rest either put up with daily or even hourly brown outs, or do not have electric via power stations at all. We are now in a planet of 7 billion and under current usage there is alot of coal.
However, the 5.5 billion are now starting to catch up and that is where the shortage lays. These poorer nations will be building cheaper stations that are far more inefficient than those being built and used in already developed nations, so it is not just a case of lowering the reserves in accordance to each new plant being built. According to the World Coal Association there are just over 2300 coal plants in operation around the world, in the last 15 years over 600 have been built in china alone... and China is pretty small by population means compared to the rest of the world that doesn't have these power plants. Hundreds more are due to come online within the next decade.
World Coal Association says "The reserves to production (R/P) ratio provides an indicator of how long proved coal reserves will last at the current rate of extraction. BP calculated this to be 118 years for coal at the end of 2010.
So if we double the number of coal power stations in the next 15 years, which is probably quickly likely with China building yet more, India being another rising superpower, Brazil being another rising superpower, Russia ressurging... and all the other nations who cannot afford the likes of river dams etc... doubling that number is a real possibility. The reserves will be far less than half because of the poor designs.
Coal is central to the entire Energy Crisis which is universally predicted by businesses and scientists.