; (2) utilize the best available estimates of the social cost of carbon, as determined by the Chair of the Council on Environmental Quality; and (3) identify alternatives and mitigation measures to avoid or reduce greenhouse gas emissions of the proposed major Federal action. (c) Social cost of carbon defined In this section, the term social cost of carbon means a quantification, in dollars, of the long-term damage caused by a ton of carbon dioxide emissions in a given year. 611. Establishment of community benefits agreements (a) Consideration in NEPA When carrying out the requirements of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. ) by preparing an environmental document for a proposed major Federal action that may have reasonably foreseeable adverse public health or environmental impacts, the lead agency shall take into consideration whether a project sponsor has entered into a community benefits agreement with a State, a unit of local government, an Indian Tribe, a labor organization, or a community benefits organization that may include the disbursement of funds for social, economic, or environmental benefits that will— (1) offset adverse impacts resulting from the construction or operation of the proposed major Federal action