RT null T1 Procurement Guidelines for Sustainable Construction Materials A1 United Nations Environment Programme, K1 public procurement K1 environmental friendly procurement K1 industrial procurement K1 sustainable development K1 construction industry K1 resource conservation YR 2022 FD 2022-01 LK https://wedocs.unep.org/handle/20.500.11822/37887 UL https://wedocs.unep.org/handle/20.500.11822/37887 DS UN Environment Document Repository RD Sep 21, 2026