Each coupon is good for two tons of subsidized coal, enough for each household to last through the winter and early spring. The coupons are coming after a shortage of the fuel drove up prices and led to widespread power curbs last month.... Still, meteorologists in the country have warned a weak-to-moderate La Nina pattern is forecast in the coming months, with frigid weather and continuous droughts likely hitting some regions. China’s benchmark thermal coal futures on the Zhengzhou Commodity E