Natural gas bulls betting on the world's largest and fastest-growing power market to drive global demand over the next couple of decades could be in for disappointment. According to Global Energy Monitor (GEM), Asia's largest economies have three times more coal-fired power capacity under construction than gas-fired capacity, with coal accounting for ~45% of the region’s power generation. Asia’s largest economies are developing far more solar, wind and hydropower capacity than gas-fired capacity. According to GEM, across 10 of Asia's…