7 U.S.C. § 1738o
The President may sell to an eligible country up to 40 percent of such country's qualified debt, only if an amount of the local currency of such country (other than the price paid for the debt) equal to-
whichever is less, is used by such country through an Environmental Fund for eligible activities described in section 1738k of this title.
For purposes of this section, the term "Environmental Fund" means an Environmental Fund established under section 1738g of this title. In the case of Mexico, such fund may be designated as the Good Neighbor Environmental Fund for the Border.
The President should advise eligible countries on the procedures required to establish and operate the Environmental Funds required to be established under paragraph (1).
The President shall establish the terms and conditions, including the amount to be paid by the eligible country, under which such country's qualified debt may be sold under this section.
The authorities provided by this section may be exercised only in such amounts and to such extent as is provided in advance in appropriations Acts.
A sale of debt under this section shall not be considered assistance for purposes of any provision of law limiting assistance to a country.
A sale of debt authorized under this section shall be accomplished at the direction of the Facility. The Facility shall direct the Commodity Credit Corporation to carry out such sale. The Commodity Credit Corporation shall make an adjustment in its accounts to reflect the sale.
The proceeds from a sale of qualified debt under this section shall be deposited in the account or accounts established by the Commodity Credit Corporation for the repayment of such debt by the eligible country.
Before any sale of qualified debt may occur under this section, the President should consult with the eligible country's government concerning such sale. The topics addressed in the consultation shall include the amount of qualified debt involved in the transaction and the uses to which funds made available as a result of the sale shall be applied.
7 U.S.C. § 1738o