能源替代在人类历史上不断地进行着。人类最早使用的能源是薪柴,是一种自然能源、可再生能源。为了寻求更高的能源经济效益,人类用煤炭去替代薪柴,煤炭是化石能源,大气污染物和CO2排放量多,是最肮脏的能源。但当时环境和气候变化还不突出。这是人类历史上的第一次能源替代。紧接着的能源替代是用石油和天然气去替代煤炭,煤炭、石油、天然气都是化石能源,石油、天然气都比煤炭干净,特别是天然气,不仅比煤炭、石油干 Energy substitutions continue to go on in human history. The earliest human use of energy is firewood, is a natural energy, renewable energy. In order to seek higher energy and economic benefits, human beings use coal instead of fuelwood. Coal is a fossil energy source with a large amount of air pollutants and CO2 emissions, making it the dirtiest energy source. But the environment and climate change were not prominent at the time. This is the first time in human history energy alternative. Immediately after the energy alternative is to use oil and natural gas to replace coal, coal, oil, natural gas are all fossil fuels, oil, natural gas are clean than coal, especially natural gas, not only than coal, dried petroleum