CO_2 Is Not the Only Gas

摘要

In 1971, one of the first international assessments of the role of humankind in climate change concluded that "because methane has no direct effects on climate...it is considered of no importance" [(1), p. 242]. How times change. By the mid-1980s, methane and a host of other non-CO_2 gases were together recognized to be contributing to climate change by an amount comparable to that of CO_2.