虽然我们并不希望如此，但煤炭仍然在所有能源中最廉价、也最可靠：国际能源机构估计即使征收巨额碳税，但到2040年，煤炭的平均价格仍然比太阳能和风能更廉价。
While we would wish otherwise, it often remains the cheapest, most dependable energy source: the IEA estimates that, by 2040, coal will still be cheaper, on average, than solar and wind energy, even with a sizeable carbon tax.