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Simultaneous harvest failures across major crop-producing regions are a threat to global food security. Concurrent weather extremes driven by a strongly meandering jet stream could trigger such events, but so far this has not been quantified. Specifically, the ability of state-of-the art crop and climate models to adequately reproduce such high impact events is a crucial component for estimating risks to global food security. Here we find an increased likelihood of concurrent low yields during summers featuring meandering jets in observations and models. While climate models accurately simulate atmospheric patterns, associated surface weather anomalies and negative effects on crop responses are mostly underestimated in bias-adjusted simulations. Given the identified model biases, future assessments of regional and concurrent crop losses from meandering jet states remain highly uncertain. Our results suggest that model-blind spots for such high-impact but deeply-uncertain hazards have to be anticipated and acc
Elizabeth Kolbert on a record-breaking rise in global sea-surface temperatures, which suggests that scientists may not understand how fast the climate is changing.
Elizabeth Kolbert writes about this week’s summit on biodiversity, where delegates will consider ambitious new conservation targets—even though the old ones have yet to be achieved.
The American West has gone bone dry, the Great Salt Lake is vanishing and water levels in Lake Mead and Lake Powell, the two great life-giving reservoirs on the Colorado River basin, are declining with alarming speed. Wildfires are incinerating crops in France, Spain, Portugal and Italy, while parts of Britain suffocated last week in temperatures exceeding 100 degrees Fahrenheit.
An analysis of satellite images by The New York Times rebuts claims by Russia that the killing of civilians in Bucha, a suburb of Kyiv, occurred after its soldiers had left the town. When images emerged over the weekend of the bodies of dead civilians lying on the streets of Bucha — some with their hands bound, some with gunshot wounds to the head — Russia’s Ministry of Defense denied responsibility. In a Telegram post on Sunday, the ministry suggested that the bodies had been recently placed on the streets after “all Russian units withdrew completely from Bucha” around March 30.
Approval of the Intergovernmental Panel on Climate Change (IPCC) Working Group II report on Impacts, Adaptation and Vulnerability in a virtual session (14-25 Feb). Press conference (virtual) at 10:00 a.m. CET (Berlin) on Monday, 28 February 2022 – 04.00 EDT (New York), 09:00 GMT (London), 12:00 EAT (Nairobi), 16:00 ICT (Bangkok) Information about media registration is available here. The deadline for registration is Friday, 18 February 2022.
A chunk of Antarctic ice that was one of the biggest icebergs ever seen has met its end near South Georgia. Scientists will be studying its effects on the ecosystem around the island for some time.
The United Nations secretary general, António Guterres, on Monday issued a blistering critique of the world’s failure to rein in global warming, calling on countries to return every year to review their climate targets — not every five years, as the Paris climate agreement spells out. “Even if the recent pledges were clear and credible — and there are serious questions about some of them — we are still careening towards climate catastrophe,” he said at the opening ceremony of COP26, the U.N. climate summit in Glasgow.
Dr. Horowitz, who lives in New Orleans, is the author of “Katrina: A History, 1915-2015.”
