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The deepest reaches of the ocean are ventilated by sinking of cold and relatively saline seawater around Antarctica. Observations from the Australian sector of the Southern Ocean reveal a decline in sinking and abyssal ventilation, linked to dropping ocean salinity on the Antarctic shelf.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01662-z2023-05-25 DOI: 10.1038/s41558-023-01662-z
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The value of climate change mitigation largely depends on the social discount rate, which has almost exclusively been influenced by economists. A survey of expert philosophers shows that, as a group, they support the same social discount rate as economists, resulting in the same mitigation policy, but for different ethical and practical reasons.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01693-62023-05-25 DOI: 10.1038/s41558-023-01693-6
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The ozone layer is slowly recovering due to the Montreal Protocol. The only exception is the ozone in the tropical lower stratosphere, which keeps decreasing. Now, a modelling study demonstrates that the tropical ozone loss is partly driven by ozone-depleting very short-lived substances that are not regulated by the Montreal Protocol.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01687-42023-05-25 DOI: 10.1038/s41558-023-01687-4
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The drivers of uncertainties in hydrological sensitivity, the global-mean precipitation response to warming, are currently not well understood. Here the authors show that the spatial pattern of sea surface temperature warming explains much of this uncertainty and could allow to constrain projections.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01678-52023-05-25 DOI: 10.1038/s41558-023-01678-5
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In contrast to the overall recovery of stratospheric ozone, ozone depletion in the tropical lower stratosphere has been ongoing over recent years. Here the authors show that currently unregulated halogenated ozone-depleting very short-lived substances play a key role in this ongoing depletion.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01671-y2023-05-25 DOI: 10.1038/s41558-023-01671-y
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Economists often dominate public climate policy discussions, such as those on the proper social discount rate and optimal climate pathways. This Article shows that philosophers, experts in underlying ethical matters, generally agree with economists but put more weight on various normative considerations.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01681-w2023-05-25 DOI: 10.1038/s41558-023-01681-w
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Antarctic bottom water (AABW), a key component of ocean circulation, provides oxygen to the deep ocean. This work shows that AABW transport reduced over the past decades in the Australian Antarctic Basin, weakening the abyssal overturning circulation and decreasing deep ocean oxygen.Nature Climate Change, Published online: 2023-05-25; doi:10.1038/s41558-023-01667-82023-05-25 DOI: 10.1038/s41558-023-01667-8
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.