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   Ferguson, Grant; McIntosh, Jennifer C (May 2025, Annual Review of Environment and Resources)

   Fossil groundwaters make up a substantial fraction of the Earth's fresh water and are being targeted for water supply wells at increasing rates. These groundwaters were recharged more than 12,000 years ago, often in climate conditions that were much different from those of today. Because of the long renewal times involved, fossil groundwaters have often been classified as nonrenewable. However, groundwater ages provide little insight into how water levels and fluxes will change as the result of pumping. The relationship between groundwater ages and these outcome-based metrics of renewability is not straightforward. Therefore, whether a groundwater is fossil or not may have little to do with its renewability. The hydraulic response of an aquifer system to pumping is not strongly related to groundwater age. The use of both modern and fossil groundwater can be unsustainable. 

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   Transformational change is not always intentional. However, deliberate transformations are imperative to achieve the sustainable visions that future generations deserve. Small, unintentional tweaks will not be enough to overcome persistent and emergent urban challenges. Recent scholarship on sustainability transformations has evolved considerably, but there is no consensus on what qualifies transformational change. We describe variations in current discussions of intentional sustainability transformations in the literature and synthesize strategies from funding institutions’ recent requests for proposals for urban sustainability transformations. Research funding initiatives calling for transformational change are increasingly common and are an important driver of how transformational change is articulated in research-practice in cities. From this synthesis, we present seven criteria for transformational change that provide direction for framing and implementing transformational change initiatives. 

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