The EPA said its finding was based on a rigorous review of science on six greenhouse gases: carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride.

• EPA表示他们的研究报告是通过对二氧化碳、甲烷、氧化亚氮、氢氟碳化物、全氟碳化物以及六氟化硫这六种温室气体的严格科学审查得出的。