More disturbingly, coal, oil, and gas are projected to supply most of the world’s growing energy needs for decades to come. If that continues, the concentration of CO2 will rise to twice the pre-industrial level by 2050, and three times that level later in the century.
更让人不安的是，预计在未来的数十年里，煤、石油和天然气将供应全球大部分不断增长的能源需求。如果这种情况继续下去，到2050年，二氧化碳浓度将上升到前工业时代的两倍，到本世纪末则将上升到前工业时代的三倍。