Yet such investment will not be financed easily: its return depends on a still-elusive carbon price and will often materialize only in the long run, while improving energy efficiency implies replacing hundreds of millions of outdated vehicles and refitting hundreds of millions of energy-voracious buildings. Adequate financing instruments are required for the right purpose at the right place and at the right scale.
但这笔投资的融资绝不容易：投资回报取决于依然难以理解的碳定价，并且通常需要长期才能收回，而改进能源效率意味着淘汰数亿量陈旧车辆、修缮数亿栋耗能建筑。在正确的地方以正确的规模追求正确的目的需要充足的融资工具。