103 of the McKinney-Vento Homeless Assistance Act ( 42 U.S.C. 11302 )) or at risk of homelessness (as such term is defined in section 401 of such Act ( 42 U.S.C. 11360 )). (b) Water and energy efficiency Not less than 10 percent of all amounts made available pursuant to this section shall be used only for activities relating to water and energy efficiency and, at the Secretary’s discretion, other strategies to reduce emissions. 7. Single-Family Housing Repair Loans and Grants (a) In general There is authorized to be appropriated for carrying out single family housing repair loans and grants under section 504 of the Housing Act of 1949 ( 42 U.S.C. 1474 ) $100,000,000 and any amounts appropriated pursuant to this section shall remain available until expended. (b) Water and energy efficiency Not less than 10 percent of all amounts made available pursuant to this section shall be used only for activities relating to water and energy efficiency and, at the Secretary’s discretion, other strategies to reduce emissions. 8. Native American Housing Block Grant Program (a) In general There is authorized to be appropriated for carrying out the Native American housing block grant program under title I of the Native American Housing Assistance and Self-Determination Act of 1996 ( 25 U.S.C. 4111 et seq.) $1,000,000,000 and any amounts appropriated pursuant to this section shall remain available until expended. (b) Water and energy efficiency Not less than 10 percent of all amounts made available pursuant to this section shall be used only for activities relating to water and energy efficiency and, at the Secretary’s discretion, other strategies to reduce emissions. 9. HOME Investment Partnerships Program (a) In general There is authorized to be appropriated for carrying out the HOME Investment Partnership Program under title II of the Cranston-Gonzalez National Affordable Housing Act ( 42 U.S.C. 12721 et seq.) $5,000,000,000 and any amounts appropriated pursuant to this section shall remain available until expended. (b) Water