Seven leading scientists say that nine climate tipping points are now ‘active’ (University of Exeter). Writing for the journal Nature in the form of a Comment, this group represents the highest level of scientists who focus on the impacts of natural feedbacks that are expected to materialize over the long term as the planet grows warmer. More than half of the climate tipping points they had identified a decade ago are now active, threatening unprecedented changes much earlier than expected. “…as science advances, we must admit that we have underestimated the risks of unleashing irreversible changes, where the planet self-amplifies global warming. This is what we now start seeing, already at 1°C global warming…..In our view, the consideration of tipping points helps to define that we are in a climate emergency and strengthens this year’s chorus of calls for urgent climate action.”
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–Their report, written in everyday language, can be read in full at this link:
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A new poll from Pew Research covering differences in how Americans think about climate change, energy and the environment. Much attention is given to political differences, including a breakdown of differences within the Republican Party, and differences based on age, gender, location and so on. Very informative.
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About the relationship between global water supplies and agriculture, and its future (World Resources Institute). The authors use nine graphs to explain why our ability to feed the predicted population growth will likely be limited by the availability of fresh water. It confirms the understanding that any viable solutions will have to find a way to overcome or get around certain hard and stubborn facts, including probable changes in the globe’s climate.
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New research finds that Lake Victoria has completely dried up twice in the past, and could do so again within a century (Eos). “Lake Victoria in eastern central Africa supports over 40 million people, the industrial sectors of three large nations, and the largest freshwater tropical ecosystem in the world. New research, however, suggests that the lake might not be around to do all of this in the not-so-distant future.”
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“Carbon Emissions Rise to Highest Level in at Least Three Million Years” (EcoWatch). This post contains a brief video which I think is quite effective and fully backed by well-qualified scientific studies, all of which have often been reported upon in previous Climate Letters. References to climate conditions in the Pliocene need to be given more publicity because we are already on the verge of moving into an even more powerful setting with our relentless greenhouse gas emissions. (This relates to the first story in today’s letter.)
Carl