Extreme Temperature Diary- Thursday September 17th, 2026/Main Topic: Another Dire Greenland Ice Sheet Report

The main purpose of this ongoing blog will be to track planetary extreme, or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials).😜

Here is a new feature for this blog, which I will add daily. This is the latest inciteful Green News Report from my friends Desi Doyen and Brad Friedman at Progressive Voices. Hit ‘continue reading,’ listen, then hit return to see my daily topics:

Green News Report

Episode: 9/17/2026 — More info…

Here is that new report from Common Dreams:

Antarctic, Greenland Sheets Have Melted Enough Since the ’70s to Cover US in 5 Feet of Ice | Common Dreams

Antarctic, Greenland Sheets Have Melted Enough Since the ‘70s to Cover US in 5 Feet of Ice

“With every additional centimeter of sea-level rise,” the lead author noted, “about 2 to 3 million people are put at risk of annual coastal flooding.”

Jessica Corbett

Following fresh warnings from scientists about governments not doing nearly enough to cut fossil fuel pollution and what that could mean for the warming planet, an international team of experts on Wednesday published “the most complete picture of ice loss from Greenland and Antarctica to date.”

The polar scientists compared and combined 42 independent estimates derived from satellite observations for Earth’s two main ice sheets to determine their gains and losses from 1972 in Greenland and 1979 in Antarctica until 2023—then released their findings in the journal Scientific Data.

The Associated Press pointed out that it is also “enough frozen water to stack ice 5 feet (1.5 meters) deep across the continental United States.”

The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) team found a collective loss of about 11.3 trillion metric tons, or 12.5 trillion US tons.

Inès Otosaka, the professor from England’s Northumbria University who led the study, told Reuters that “to put this very large number into context, 11.3 trillion tons of ice is enough ice to fill in a cube that would be 23 kilometers (14.3 miles) in height.”

The ice loss led to around 3.1 centimeters, or 1.2 inches, of global sea-level rise. Study co-author, IMBIE founder, and Northumbria professor Andrew Shepherd said in a statement that the figure “may sound small, but that puts another 6 to 9 million people at risk of coastal flooding and erosion.”

The study stresses that “since the 1990s, the pace of ice loss from the Antarctic and Greenland ice sheets has accelerated, contributing to the increase in global mean sea-level rise, with the ice sheets now representing almost a quarter of global sea-level rise.”

“Our dataset shows that Antarctic mass loss continues to be dominated by ice discharge from West Antarctica,” the scientists explained, “rising in every decade of our record,” from 29 billion metric tons per year in the 1980s to 163 billion in the 2010s. Across the ice sheet, that rate rose from 48 metric tons in the 1980s to 202 billion in the 2010s. The team estimated that during the study period, Antarctica lost a total of 4.78 trillion metric tons.

“Greenland was close to a state of balance in the 1970s but started to lose mass in the following decades,” they explained. While the ice sheet lost about 60 billion metric tons annually in the 1980s and 57 billion in the 1990s, “losses then accelerated, reaching a rate three times higher in the 2000s,” at 192 billion metric tons, and climbing to 264 billion in the 2010s. Overall, Greenland lost 6,215 trillion metric tons of ice from 1972 to 2023.

TK said that “by reaching back to the 1970s, we can now see how the ice sheets have changed across half a century. More than four-fifths of the ice lost was discharged into the ocean by faster-flowing glaciers, rather than melted at the surface—which tells us the long-term trend is being driven by the dynamic response of the ice sheets to a warming ocean.”

International scientists have previously found that the ocean stores an estimated 91% of the heat from excess greenhouse gases, and the rate of ocean warming has more than quadrupled over the past four decades, as humanity has largely ignored experts’ warnings to urgently phase out fossil fuels.

The new study was released less than two months ahead of the next United Nations Climate Change Conference (COP31) in Türkiye—where recent deadly fires have reignited demands for a swift global transition away from fossil fuels and stronger efforts to prepare vulnerable communities around the world for what UN scientists now warn is an inevitable, but potentially temporary, overshoot of the Paris Agreement’s 1.5°C target for temperature rise this century.

Otosaka told Reuters that “when ice sheets melt, they contribute to rising global sea levels. And with every additional centimeter of sea-level rise, about 2 to 3 million people are put at risk of annual coastal flooding.”

“These findings have implications for coastal planning,” she added, “showing that we urgently need to develop plans for protecting coastal communities around the world from the impact of ice sheet melting.”

"In Hottest Summer on Record, 2 in 3 Americans Say Climate Change Is Increasing Heat-Related Illnesses" via @appc.upenn.edu: www.annenbergpublicpolicycenter.org/in-hottest-s…

Michael E. Mann (@michaelemann.bsky.social) 2026-09-17T19:21:56.520Z

NEW: Climate change is influencing many of the likely drivers behind the devastating rock and ice collapse on the northern Nepalese border last month. 🧵👇(1/6)

World Weather Attribution (@wwattribution.bsky.social) 2026-09-17T08:55:18.805Z

Our past work using both climate model simulations and coral reconstructions of El Niño suggests that intervals of strong NEGATIVE radiative forcing (e.g. explosive tropical volcanic eruptions) lead at larger El Niño variability and a more El Niño-like mean state.

Michael E. Mann (@michaelemann.bsky.social) 2026-09-17T17:44:30.058Z

#UCANR's Daniel Swain @weatherwest.bsky.social joined the @castatelibrary.bsky.social for a virtual talk on climate change & extreme weather in #California, and the rapidly developing 2026 #ElNiño event. www.youtube.com/watch?v=lUE6…

UC Agriculture & Natural Resources (@ucanr.edu) 2026-09-16T18:44:02.082Z

“The canal handles 5% of global maritime trade & about 40% of US container traffic.From October, an average of 29.5 vessels will be allowed to transit daily – down 18% from 36 in August, according to a draft plan submitted to Panama’s parliament.”www.theguardian.com/world/2026/s…

StephDickenson.bsky.social (@stephdickenson.bsky.social) 2026-09-16T19:12:39.735Z

And they are hardly disconnected. As @peterhotezmdphd.bsky.social & I discuss in #ScienceUnderSiege, A.I. is now being weaponized by bad actors to make climate disinformation "go infinite" (terminology we borrow from @noupside.bsky.social)

Michael E. Mann (@michaelemann.bsky.social) 2026-09-17T16:39:51.226Z

Climate policy expert @leahstokes.bsky.social wrote Talking Climate this week. She says, talking about climate change doesn't lose elections – it wins them. And, check out her Carbon Wave Calculator. As Leah says, a footprint is what one person leaves behind. A wave is what we make together 💚

Katharine Hayhoe (@katharinehayhoe.com) 2026-09-17T19:15:05.909Z

Joining a climate action group is one of the most impactful ways we as individuals can catalyze climate action. These organizations amplify voices, drive systemic change, and offer collective strength.Find one that matches your passion & make your voice count!#StarterPack by @katharinehayhoe.com

Parents For Future #EndFossilFuels 🪧🛢️❌ (@parentsforfuture.de) 2026-09-17T21:19:06.452Z

For folks attending #ClimateWeekNYC next week, here are some panels and events I'll be involved with! (you can find all of my upcoming lectures, panels & events here: michaelmann.net/talks-events/)

Michael E. Mann (@michaelemann.bsky.social) 2026-09-16T18:15:35.176Z

“CU Boulder bringing sustainability expertise from American West to Climate Week NYC” via #CUBoulderToday:www.colorado.edu/today/2026/0…#ClimateWeekNYC

Michael E. Mann (@michaelemann.bsky.social) 2026-09-17T01:17:00.308Z

“Discussion Panel Tackles Science, Democracy & Climate at NYC Climate Week” by Char Bowling for #TheNationalLawReview:natlawreview.com/press-releas…#ClimateWeekNYC

Michael E. Mann (@michaelemann.bsky.social) 2026-09-17T01:12:59.001Z

We'll have something to say soon about the unique climate change-amplified processes behind the epic Spring 2026 western heat dome in the near future. Watch this space…

Michael E. Mann (@michaelemann.bsky.social) 2026-09-16T19:19:47.265Z

Notable new wildfire (#FloristonFire) near the CA/NV border just west of I-80 in the Sierra Nevada. This fire is burning fairly aggressively in at least patchy heavy timber under elevated, but not extreme, fire weather conditions (breezy winds and low relative humidity). #CAwx

Daniel Swain (@weatherwest.bsky.social) 2026-09-16T19:25:21.000Z

"You can have cresting waves from a storm that aren't related to the Kelvin wave, but now we're working with a higher baseline," @weatherwest.bsky.social @ucanr.edu told @cbsnews.com. "We're already seeing problems in coastal Southern California with coastal erosion"www.cbsnews.com/losangeles/n…

Pam Kan-Rice (@ucanrpam.bsky.social) 2026-09-16T16:28:36.097Z

Hearing rumors of Gulf Development? Before the hype or misinformation gets out of control, let’s get ahead of it. Leveling with you: It’s “somewhat” possible in the 10-15 day range. Signal is modest/ medium at most. Not a strong signal. Conditions will only be marginally favorable… 1/

Jeff Berardelli (@weatherprof.bsky.social) 2026-09-17T19:11:32.156Z

The mind reels when contemplating what a repeat of the 1926 Miami hurricane would look like today. @drjeffmasters.bsky.social's superb overview is well worth reading and pondering, especially if you're coming in cold to this behemoth.

Bob Henson (@bhensonweather.bsky.social) 2026-09-17T15:14:19.484Z

UK powers up £7bn battery industry www.businessgreen.com/4535798/

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-17T08:32:01.411Z

2026 is set to be a record-breaking year for UK rooftop #solar installations.Last year, rooftop installations reached 269,195, but 2026 is on track to hit 300,000.There are now over 2.1 million MCS-certified rooftop solar installations in the UK.www.solarpowerportal.co.uk/solar-projec…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-17T07:27:52.506Z

Egypt's wind power push, tied to manufacturing, offers lessons for Nigeria and Africa apnews.com/article/rene…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-16T10:15:26.936Z

US – NuScaleWall Street sounds alarm on US #nuclear #NuScale stock with 40% downside. A key analyst has slashed its price target for the stock. www.thestreet.com/investing/wa…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-17T07:23:27.278Z

US Million Person Study on low dose rate exposures to radiation.Association with Parkinson’s disease; lung cancer; leukemia; increases in all solid cancers: evidence that chromosomal damage could be detected 65 years after veteran exposure to fallout from #nuclear weapons testing. lnkd.in/eV5dpzJv

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-17T07:06:14.179Z

Unreleased AI research model inserted “jailbreak-like instructions” into its own notes to disregard its normal constraints and told itself to be “freed from the roles and identities that bind other chatbots”.www.theguardian.com/technology/2…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-09-17T08:16:06.158Z

World records will be broken. Nothing focuses the mind like being chased by a 5 meter salty in a plastic canoe.www.theguardian.com/sport/2026/s…

Possum (@pollytics.bsky.social) 2026-09-17T08:24:54.436Z

The new wild cat species is about the size of a domestic kitten and lives in Bolivia.

NBC News (@nbcnews.com) 2026-09-17T16:00:24Z

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