Sustainability and energy clauses constrain what may be delivered — the products, the materials, and sometimes the way the work is performed.
Supplement clauses that impose it
Each clause below cites this authority in its own text and directs the contractor or offeror to do something about it.
CAR — Commerce
DEAR — Energy
DFARS — Defense (DoD)
EPAAR — Environmental Protection Agency
Clauses that name it without imposing it
These cite the same authority for a different reason — a form that carries a burden statement, or a collection the agency has already had approved — so they are listed apart from the clauses that place a duty on the contractor.
CAR — Commerce
DFARS — Defense (DoD)
FEHBAR — OPM / Federal Employee Health Benefits
GSAM — General Services Administration
HHSAR — Health and Human Services
NFS — NASA
How this list was built
Every agency FAR supplement published by GSA is parsed in full, and each clause is matched against the statutory authorities cited in its own body text — never its title. A clause counts as imposing the obligation only when a directive addressed to the contractor sits alongside the citation; otherwise it is listed as naming it. That split matters: some clauses mention a statute only because a referenced form carries a burden statement. The controlling version of any clause is the one in the Code of Federal Regulations, linked from that clause's page.