We address the question of how to provide meaningful scientific information to support environmental decision making at the regional scale and at the temporal scale of several decades in a network of marine parks in the Kimberley region of Western Australia. Where environmental sustainability is affected by slow-dynamics climate change processes and one-off investments in large infrastructure which can affect a region for decades to come, both strategic and reactive planning is necessary and prediction becomes as urgent as standard adaptive management. At the interface between future studies, socioeconomic modelling and environmental modelling, we define 18 scenarios of economic development and climate change impacts and five management strategies. We explore these potential futures using coupled models of terrestrial and marine ecosystem dynamics. We obtain a projection of the Kimberley marine system to the year 2050, conditional on the chosen scenarios and management strategies. our results suggest that climate change, not economic development, is the largest factor affecting the future of marine ecosystems in the Kimberley region, with site-attached species such as reef fish at greatest risk. These same species also benefit most from more stringent management strategies, especially expansion of sanctuary zones and Marine protected Areas. The Kimberley region of Western Australia comprises ~420,000 km 2 of land area and ~320,000 km 2 of marine waters (including waters out of to the edge of EEZ) with a population of ~40,000. It is renowned for its remoteness, physical beauty, pristine ecosystems, diverse biota, complex coastline, and rich Aboriginal history. Large portions of the marine region are recognised as part of a conservation reserve network, including national parks and indigenous protected areas. It also possesses considerable natural resources in terms of minerals and offshore/ onshore hydrocarbons, food production (agriculture, fishing and aquaculture) and a growing tourism industry. Both State and regional governments are committed to balance growth in population, economic activity and land, coastal and marine uses to ensure employment and improved standard of living for its current and future population with environmental and social objectives, including preservation of the natural heritage and the cultural values of its Aboriginal population. In 2012 the Australian government established the Northwest Network Marine Parks to protect one of the world's most ecologically diverse marine areas 1. These national parks (Kimberley, 80 Mile Beach, Roebuck Bay, Ashmore Reef, Argo-Rowley Terrace) are located in Commonwealth waters (3-200 NM). The Kimberley also includes the Great Kimberley Marine Park (a network of six marine parks) declared by the state government of Western Australia (2018) located up to 3 nautical miles from the coast (80 Mile Beach, Lalang-garram/Camden Sound, Yawuru Nagulagun/Roebuck Bay, North Lalang-garram, Lalang-garram/Horizontal Falls, and North Kimberley) (see Supplementary Fig. ...