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Recognizing the value of large marine ecosystems (LMEs) and other transboundary water systems (open ocean, groundwater aquifers, lakes and reservoirs, and river basins), their continued degradation, the fragmented approach to their management, and the need for better prioritization of interventions, the Global Environment Facility (GEF) embarked on the Transboundary Waters Assessment Programme (TWAP) from 2009 to 2015. TWAP objectives were to undertake global assessments of the five transboundary water systems to assist GEF and other international organizations set priorities for interventions; and develop formal institutional partnerships for periodic assessments of these systems.

The Open Ocean Assessment provides a baseline review of issues linking human well-being with the status of the open ocean through the themes of governance, climate change, ocean ecosystems, fisheries, pollution, and integrated assessment of the human-ocean nexus. It uses indices and indicators where data exist, in many cases with future projections due to global climate change, complemented by expert scientific assessment of numerous low certainty but potentially high impact issues where global ocean monitoring is inadequate.

Migratory birds are part of the lives of many people around the world: little children who are shown their first swallows' nest by their grandfather city dwellers, who hear the calling of geese overhead, herdsmen, whose animals are followed by wagtails and harriers that feed on flushed insects; fishermen on every sea, whose boats are accompanied by albatrosses, shearwaters or boobies.