effects means the adverse effects of greenhouse gases on health or welfare caused by the greenhouse gas’s heat-trapping potential or its effect on ocean acidification. (10) Lifecycle greenhouse gas emissions The term lifecycle greenhouse gas emissions has the meaning given that term in section 211 of the Clear Air Act ( 42 U.S.C. 7545(o)(1)(H) ). (11) Natural gas The term natural gas means any fuel consisting in whole or in part of natural gas, including components of natural gas such as methane and ethane