Compare the yearly greenhouse gas emissions from 1 GWe(gigawatt-electric) power stations powered by natural gas and windturbines. The energy content of natural gas is 55 MJ/kg, and theelectrical converting efficiency is 40%. Wind turbines do not emitCO2 as they harness the wind but emissions do occurduring the manufacturing of the turbine. For USA, assume theCO2 emission per GDP is approximately 500 Tonnes / $ 1million of GDP. For wind turbines, it costs $2 million for a 1 MWeplant, which has an efficiency of 0.3, and the yearly maintenanceis approximately 2% of the initial cost. Assume the averagelifetime of a wind turbine is 20 years.
