Natural gas is excluded for several reasons. The mining, transport, and use of conventional natural gas for electric power results in at least 60-80 times more carbon-equivalent emissions and air pollution mortality per unit electric power generated than does wind energy over a 100-year time frame. Over the 10-30 year time frame, natural gas is a greater warming agent relative to all wind, water, and sunlight (WWS) technologies and a danger to the Arctic sea ice due to its leaked methane and black carbon-flaring emissions (discussed more below). Natural gas mining, transport, and use also produce carbon monoxide, ammonia, nitrogen oxides, and organic gases. Natural gas mining degrades land, roads, and highways and produces water pollution.