An anonymous reader quotes a report from CBS News: Greenhouse gas concentrations in the atmosphere rose to record highs in 2025, locking in climate impacts that will persist for centuries, the United Nations said on Tuesday. Levels of the three main greenhouse gases -- the climate-warming carbon dioxide, methane and nitrous oxide -- all rose to unprecedented figures in 2025, the U.N.'s weather and climate agency said. The World Meteorological Organization said the rise would lead to more long-term temperature increases for the planet. The bulletin looks at greenhouse gas concentrations -- the amount of those gases in the atmosphere -- rather than new annual emissions amounts as the world burns more coal, oil and gas. In 2025, carbon dioxide concentrations were at 426.8 parts per million (ppm); methane at 1,948 parts per billion, and nitrous oxide at 339.1 parts per billion. That takes them, respectively, to 153%, 267% and 126% of the pre-industrial levels witnessed before 1750. Of the three major greenhouse gases, CO2 accounts for about 66% of the warming effect on the climate. Around half of the total CO2 emitted each year remains in the atmosphere; the rest is absorbed by the land and oceans. From 2024 to 2025, the global average concentration of CO2 rose by 2.8 ppm -- smaller than the record surge from 2023 to 2024 of 3.6 ppm. WMO senior scientific officer Oksana Tarasova said this reflected the "recovery of the land carbon sinks and reduced fire carbon emissions in 2025 after the strong 2023/2024 El Nino," the naturally occurring, climate-warming weather phenomenon. "However, a 2.8 ppm annual increase is still a substantial addition of carbon to the atmosphere from fossil fuel burning." It is also above the average growth rate for the past decade of 2.6 ppm -- a figure that stood at 0.8 ppm in the 1960s. "Another year, another new record," said WMO Deputy Secretary-General Ko Barrett. "Greenhouse gases are trapping an unprecedented amount of heat in the atmosphere, providing energy for more extreme weather and associated risks to our economies and societies. Further reading: UN Says Breaching 1.5C Warming Limit Is 'Imminent and Unavoidable'

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Brazil's 80-year-old president Luiz Inácio Lula da Silva was re-elected Sunday, reports the Guardian, "defeating his far-right opponent, Flávio Bolsonaro, to claim a historic fourth term in power." And the results could impact the climate, suggests the Associated Press, since under da Silva the annual deforestation rate in the Amazon fell to its lowest level since records began in 1988: Official satellite data showed the rainforest lost 3,335 square kilometers (1,300 square miles) from Aug. 2025 through July 2026, the period used to calculate the annual rate... During Jair Bolsonaro's presidency, from 2019 to 2022, Amazon deforestation surged by about 60%, with more than 45,000 square kilometers (17,400 square miles) cleared, according to official data. Under Lula, deforestation has fallen 71% since 2023, the government said. One of Lula's first moves after taking office in January 2023 for a third, non-consecutive term was to revive the Action Plan for the Prevention and Control of Deforestation in the Legal Amazon, known by its Portuguese acronym, PPCDAm. Launched in 2004 during his first administration, the plan had been shelved under Bolsonaro.... The plan has four pillars: strengthening monitoring and enforcement; promoting a sustainable economy; managing protected areas and determining how undesignated public forests should be used; and using regulations and financial incentives to curb deforestation. Measures included restoring sanctions for illegal forest clearing detected by satellites, a practice seen as the most effective tool to curb deforestation that was halted under Bolsonaro. The government also proposed barring properties with illegal deforestation from receiving bank loans and allocated more funding to priority Amazon municipalities that demonstrated reductions in forest loss. It also funded efforts to fight environmental crime and develop subsidized credit for sustainable businesses in the Amazon... Deforestation and other land-use changes are Brazil's largest sources of greenhouse gas emissions, which drive global warming. The stakes are especially high in the Amazon, which stores vast amounts of carbon dioxide and generates atmospheric moisture that helps regulate weather far beyond South America... Degradation from wildfires, logging and drought affects about 40% of the Amazon and has outpaced clear-cutting in recent years. A strong El Niño, a periodic warming of the equatorial Pacific, could intensify those threats in 2026 and 2027 by bringing hotter, drier conditions that fuel wildfires. The article notes that Lula's reelection campaign promised zero net deforestation by 2030, plus restoration to offset all forest loss, legal or illegal.

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For the first time, the UN has declared that exceeding the Paris Agreement's 1.5C warming limit is "imminent and unavoidable." "We are now saying this window has closed, but we can open it again by making the overshoot as brief as possible," UN Environment Program Executive Director Inger Andersen said on a call with reporters. "This is about how to find a way back as shortly and as quickly as possible with as limited an overshoot as possible." CNN reports: Past reports have examined the distance between countries' emissions reduction commitments and what it would take to limit global warming to 1.5 C above preindustrial levels. However, this year's report redefines the gap. Instead, it examines new emissions overshoot scenarios, and what it would take to limit peak warming to just 1.7 to 1.8 degrees C before bringing temperatures back down to 1.5 C through emissions cuts and the use of carbon removal technologies. The report makes clear that every additional fraction of a degree of warming above 1.5 C "raises the risk of irreversible changes including in ice sheets, permafrost carbon, ocean circulation, and coral systems, along with devastating human impacts." Each added fraction of a degree of warming can have an "immense" impact "as measured in terms of damage, cost and loss of lives," said climate scientist Michael Mann of the University of Pennsylvania. Mann was not involved in producing the UNEP report. According to the UNEP, which is based in Nairobi, the lowest overshoot scenario would keep peak warming to between 1.7 and 1.8 degrees C and return global average temperatures to at or below 1.5 C by 2100. However, to follow such a pathway, global greenhouse gas emissions would need to be slashed by far more than anything currently on the table at the upcoming COP31 talks. This would require an 18% cut by 2030, 45% by 2035, and 69% by 2040, relative to 2025 levels. Meeting this lowest-possible overshoot scenario would require a tripling of renewable electricity capacity by 2035, and dramatic cuts to fossil fuels, including the phaseout of coal by 2040, the report states. In addition, there would need to be a major scaling up of carbon removal technologies, which so far have not been proven to work at such a large scale. In stark contrast to these figures, the fulfillment of existing emissions reduction pledges would only yield a 5-to-8% emissions cut by 2030 and an 11-to-15% reduction by 2035, the report found. This would be associated with a peak warming of about 2.6 degrees C. If countries simply follow their current policies, then warming could reach a peak of about 2.8 C. That estimate has increased since last year, in part because of the withdrawal of the United States from the Paris Agreement and retraction of its emissions reduction commitments, the report states. Even the scenario that assumes countries meet their existing reduction commitments, and nations with net-zero pledges succeed in fulfilling them, still brings warming to a peak of 2.1 C.

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Gizmodo reports: Roughly 84.4% of the world's coral reefs suffered bleaching-levels of heat stress during the last major marine heat wave from January 2023 to September 2025, with over half already lost compared to coral coverage in the 1950s... But there's some good news, thanks to a new study published this Wednesday in the journal Science Advances: Marine ecologists at Stanford have discovered that bleached corals can be revived via contact with a healthy coral neighbor, who (like a good neighbor) shares their photosynthetic, symbiotic algae (Symbiodiniaceae) with their peers. "This incredible new result — that fast and full recovery is possible in bleached coral — can inspire solutions that eventually may be scalable," [Fiorenza Micheli, a marine ecologist with Stanford's Center for Ocean Solutions and study co-author, told the journal Nature]... Unlike their controls, bleached coral in contact with healthy coral recovered in just eight weeks... [T]he surprise discovery of this method alongside the other techniques that marine conservationists are now actively pursuing — including the successful deep-freezing and revival of at-risk coral sampled from Hawaii — could offer threatened reefs the lifeline they need. Coral contact could super-charge other efforts, like the selective breeding of heat-tolerant corals and the cultivation of protected coral nurseries

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Google is expanding its Android Earthquake Alerts System from 98 to more than 200 regions worldwide, using smartphone sensors to detect early earthquake activity and warn users before potentially dangerous shaking begins. The update also enhances the system's "Be Ready" alerts with estimated earthquake magnitudes, epicenter information, maps showing affected areas, and additional safety guidance. From a Google blog post: Be Aware: A straightforward alert for estimated light shaking, letting you know an earthquake has been detected nearby. Be Ready: A detailed alert for stronger shaking, alerting you to prepare to take action. Take Action: A full-screen alert for moderate to heavy shaking, giving you immediate advice on how to stay safe. We've built-out our Be Ready alert with new helpful guidance. In the coming months, you'll see a map with a radius of where we've detected shaking, estimated earthquake magnitude, action you can take, and a button to learn more about the earthquake as information comes in.

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