Washington Post: Long considered an abundant, reliable and relatively cheap source of energy, coal is suddenly in short supply and high demand worldwide. An untimely confluence of bad weather, flawed energy policies, low stockpiles and voracious growth in Asia’s appetite has driven international spot prices of coal up by 50 percent or more in the past five months, surpassing the escalation in oil prices. The signs of a coal crisis have been showing up from mine mouths to factory gates and …