大部分研究表明，行现在开始到本世纪中叶，世界将经历深刻的去碳化，这个时间长度是由环境现实决定的。 去碳化要求所有低碳选择 — — 包括提高能源效率和可再生能源 — — 都要大幅扩大规模。
Most studies show that deep de-carbonization of the world economy from now to mid-century, a time horizon mandated by environmental realities, will require that all low-carbon options – including greater efficiency and renewables – be scaled up massively.