RT null T1 A Framework for Freshwater Ecosystem Management Volume 4: Scientific Background A1 United Nations Environment Programme, K1 freshwater ecosystem K1 water quality YR 2018 FD 2018-08 LK https://wedocs.unep.org/handle/20.500.11822/26031 UL https://wedocs.unep.org/handle/20.500.11822/26031 NO Volume 4, ‘Scientific Background”, underpins the series and includes a review of water quality guidelines for ecosystems from around the world. It was the first volume in the series to be developed, beginning in 2013 over a number of years. NO https://www.unenvironment.org/explore-topics/water DS UN Environment Document Repository RD Sep 16, 2026