Serious air quality deterioration has resulted from the massive use of coal and many Chinese cities suffer severe smog events .
Coal supplies about 80 % of China 's energy needs today , and that ratio is expected to continue , even as overall power usage grows rapidly .
Serious air quality deterioration has resulted from the massive use of coal and many China cities suffer severe smog events .
Coal supplies about 80 % of China 's energy needs today , and that ratio is expected to continue , even as overall power usage grows rapidly .