很多科学家表示，要避免二氧化碳浓度成倍增长，能源效率必须迅速且有力地增加。
Many scientists say that to avoid a doubling of carbon dioxide concentrations, energy efficiency must be increased drastically, and soon.
很多科学家表示，要避免二氧化碳浓度成倍增长，能源效率必须迅速且有力地增加。
Many scientists say that to avoid a doubling of carbon dioxide concentrations, energy efficiency must be increased drastically, and soon.
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