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This suggested evaluation is a forecasted future [1] industrial option for transporting rejected desalination factory brine to Death Valley, State of California, USA. The purpose of this proposal, which would form an anthropogenically enlarged Salton Sea, is to provide long-term storage of precipitated brine salts that in turn would foster a flat solar-reflective landscape. This macro-imagineering proposal has additional beneficiation when combined with additional industrial utilization and downwind climate regime mitigation. The goal or purpose of this macro project is established, new desalination technologies that produce 1 m3 of brine for every 10 m3 of freshwater derived from developing photovoltaic and/or geothermal technologies. A previously well-postulated floating desalination scheme for the spatially enlarged Salton Sea, could produce a maximum of ~44 km3/year of rejected brine that can, in turn, be emplaced in California’s unsettled hinterland [2]. This salty wastewater disposal proposal is offered as an economically feasible 21st Century co-dependent hydraulic-electricity grid Macro-Imagineering project.

The mangrove belt along the coast of the three Guianas, South America, forms a unique ecosystem and acts efficiently as a natural soft coastal defence structure. The general mechanisms have been studied for over four decades and the processes governing the coastal morphodynamics are now understood, at least qualitatively. They consist of an interaction between mangroves, hydrodynamics and sediment mechanics. Twenty percent of the mud discharged by the Amazon in the Atlantic Ocean is transported to the west along the coast by waves and currents in discrete mud banks of a few 10 s of km length, which travel at a speed of the order of 2 km/year. During the presence of a mud bank waves are damped, mud is trapped and colonized by mangroves. Once a mud bank has passed, the waves can attack the shore again. This results in a cycle of land accretion and erosion, with an average net gain of 1 m coast per cycle of roughly 30 years. However, in locations where too many mangroves have been removed, the coast has lost its natural resilience and the settlements and fields are prone to flooding, a concern that increases with climate change and predicted sea-level rise (SLR). Hard coastal defence structures, such as those in Guyana, are expensive and not sustainable. Based on many lessons learnt, pilot projects on mangrove rehabilitation have started. At the same time research efforts are undertaken to allow making quantitative estimates of the potential risks for the coastal communities. For this purpose, numerical prediction models are developed which can compute currents, wave action and sediment transport along the coast of the Guianas. Different climate change scenarios can be investigated. These models can serve in the near future as decision support tool for the local authorities for the management of the coastal zone.