Gas lighting explains why a large number of older gas lamps have been converted to electricity. Solar-rechargeable battery-powered gas light controllers can be easily retrofitted into existing gas lamps to keep the lights off during daylight hours and cut energy consumption and green-house gas carbon emissions by 50%. The use of natural gas (methane) for "indoor" lighting is nearly extinct. Besides producing a lot of heat, the combustion of methane tends to release significant amounts of carbon monoxide, a colorless and odorless gas which is more readily absorbed by the blood than oxygen, and can be deadly. Historically, the use of lamps
Natural gas in China Natural gas in China Over the last five years, gas consumption, production, and imports in China have grown dramatically, with two-digit growth. Considering China's immense demand for energy, gas plays a relatively small role in its energy use, with only 5% of total energy in 2012. However, Chinese authorities see natural gas as a lower-polluting and less carbon-intensive alternative to coal, and gas consumption is increasing rapidly. Natural gas is expected to supply 10% of the nation’s energy supply by 2020. China produced 112 billion cubic meters of natural gas in 2013, making it the sixth largest gas producer in