丹·卡门，在能源的教授加州大学伯克利分校和气候顾问的大学到奥巴马政府，讨论了碳税的可能性在最近的清洁能源部长级会议（CEM7）会议在旧金山。
“If we really want to bend the curve to make the transition, we need everyone to speak the same language — not always to agree, but to talk about things in the same way," said Kammen. "You just can’t get environmentalists and business leaders and elected officials to do that unless we’re valuing and pricing out the impacts. Carbon tax will get us there."
卡门认为，美国政府可以通过使碳核算“业务需求”为所有联邦合同获得碳税球滚动。
