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Mark Z. Jacobson @mzjacobson.bsky.social · 20h

New 2026 world ranking of publication impact of the top 2% of ~11.5 mil scientists publishing since 1788. Grateful my research is ranked #1,528 (top 0.013%) of 11.5 mil #2 in Meteorology & Atmospheric Sciences and #9 in Energy among those 1st publishing after 1985 web.stanford.edu/group/efmh/j...

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Mark Z. Jacobson @mzjacobson.bsky.social · 06/10/2026

"From an environment standpoint, nothing useful about ethanol" "More dangerous than gasoline-emits carcinogens & chems that worsen smog &ozone" “Supplies only ~4% of US transport energy yet occupies ~1.24% of US land" "Can power all US energy w/WWS using 0.8% of US land” san.com/cc/expanding...

san.com

Expanding the sale of fuel made from corn could boost US farmers. But at what cost?

A coalition of lobbyists and trade associations wants to give farmers a lifeline by allowing the year-round sale of a 15% ethanol fuel blend.

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Mark Z. Jacobson @mzjacobson.bsky.social · 05/10/2026

On the causal link between CO2 and air pollution mortality web.stanford.edu/group/efmh/j... Supreme Court hears case today on energy companies bid to end Boulder climate-change lawsuit www.cbsnews.com/news/supreme...

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 05/10/2026

Hey, Supreme Court, locally-emitted CO2 kills people locally. Don't let ExxonMobil, Suncor, other deniers mislead you to thinking only CO2 emitted out of state causes death or damage in the state. Enhancement of Local Air Pollution by Urban CO2 Domes web.stanford.edu/group/efmh/j...

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 02/10/2026

203 days and counting this year with WindWaterSolar meeting >100% of demand for part of the day. WWS>100% for 17.7% of all hours of year. 56% of all demand during year met by WWS Gas down 47% in '26 vs '23. No blackouts

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Mark Z. Jacobson @mzjacobson.bsky.social · 03/10/2026

74% of new residential PV in CA had batteries in '25 vs 58% in '24 Outside of CA, 17% of new PV had batteries vs 7% in '24 All US, 37% of new PV had batteries vs 25% in 2024 450,000 new US res systems in '25 (158,000 in CA; 292,000 out). Total: 5.3 mil to date www.pv-magazine.com/2026/10/03/b...

pv-magazine.com

Battery storage paired with 37% of new U.S. residential solar systems in 2025 - pv magazine Global

Battery storage was paired with 37% of new U.S. residential solar installations in 2025, up from 25% a year earlier, with adoption accelerating both in California and across other states.

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Mark Z. Jacobson @mzjacobson.bsky.social · 03/10/2026

pv-magazine.com

Battery storage paired with 37% of new U.S. residential solar systems in 2025 - pv magazine Global

Battery storage was paired with 37% of new U.S. residential solar installations in 2025, up from 25% a year earlier, with adoption accelerating both in California and across other states.

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Khashoggi's Ghost @urocklive1.bsky.social · 30/09/2026

This seems so obvious .... except to the people who think their salaries and future career opportunities depend on them not seeing the obvious. Who will get to make billions on an ongoing basis if everyone switches to cheap renewable energy?

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Mark Z. Jacobson @mzjacobson.bsky.social · 02/10/2026

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Alex Pawlowski @apawlows.bsky.social · 29/09/2026

In today's CA EPIC opening presentation, CARB chair Lauren Sanchez repeating @mzjacobson.bsky.social reporting, clean energy is leading the way in CA, solar has outperformed gas this year in energy delivered

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Mark Z. Jacobson @mzjacobson.bsky.social · 30/09/2026

Rep. Dave Min: "We should be leading the future, not subsidizing the horse and buggy." "China is dominating the clean energy sector, creating a clear national security issue, even as Repubs keep doubling down on aging and expensive fossil fuel technologies." youtube.com/shorts/VHwVo...

youtube.com

Rep. Dave Min: "We should be leading the future, not subsidizing the horse and buggy."

YouTube video by Rep. Dave Min

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Mark Z. Jacobson @mzjacobson.bsky.social · 28/09/2026

Argument For Clean Energy Has Flipped IEA's new "Electrification" lists its benefits as energy security, competitiveness, then emissions Its thesis can be traced to 2009, when M Jacobson wrote in Sci American we could power 100% of the planet w/renewables www.onlygoodnewsdaily.com/post/the-arg...

onlygoodnewsdaily.com

The Argument For Clean Energy Has Flipped | OGN Daily

It all started as a moral argument for taking climate action, but that driver has now been relegated to third place.

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Mark Z. Jacobson @mzjacobson.bsky.social · 30/09/2026

Here is also a 2009 precursor to the 2009 Scientific American paper on the energy security benefits of clean, renewable energy Review of solutions to global warming, air pollution, and energy security web.stanford.edu/group/efmh/j...

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 28/09/2026

onlygoodnewsdaily.com

The Argument For Clean Energy Has Flipped | OGN Daily

It all started as a moral argument for taking climate action, but that driver has now been relegated to third place.

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Mark Z. Jacobson @mzjacobson.bsky.social · 26/09/2026

199th of 268 days (74.3%) of the year with WindWaterSolar meeting>100% of demand for part of the day Compares with 186 days in '25 thru 268 days 119 in '24 51 in '23 56.1% of all electricity in CA produced with WWS in '26 Solar up 52%, wind up 23%, batteries up 309%, gas down 47% in '26 v '23

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Mark Z. Jacobson @mzjacobson.bsky.social · 21/09/2026

Approaching 200 days with WindWaterSolar supplying >100% of demand for part of the day 195 of 263 (74.1%) and 9 straight 100% WWS days 18% of all hours in 2026 have been >100% WWS has met 56.2% of all demand in 2026 Gas is down 48% in 2026 vs 2023, replaced by solar, wind, batteries, and imports

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Mark Z. Jacobson @mzjacobson.bsky.social · 19/09/2026

Solar alone met a peak of 102% of demand; WWS met 128% of demand Fri 9/18 on CAISO grid! CAISO now 24.27 GW solar, 12.33 GW wind, 17.23 GW batteries, vs avg demand last 12 mo of 24.3 GW Gas down 48%, wind up 23%, solar up 52%, batteries up 314% '26 v '23 WWS has met 56.3% of demand '26; Gas 20.1%

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

Energy Expert: Renewables Will Save $Trillions & Millions of Lives Avoid 7 mil air pol deaths/y Slow then reverses global warming Reduce energy needs 55% & energy costs 66% Create 23 mil more jobs than lost Need less land than current energy Keep grids stable sonomasun.com/2026/09/17/e...

sonomasun.com

Energy Expert: Renewables Will Save Trillions, Millions of Lives - Sonoma Valley Sun

Stanford Professor Provides a Roadmap By Larry Barnett The world’s use of fossil fuels has been marked by successive crises and temporary solutions. The widespread use of coal for heating and power ge...

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

sonomasun.com

Energy Expert: Renewables Will Save Trillions, Millions of Lives - Sonoma Valley Sun

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

This rendered the impact both non-conserving (since interpolations result in non-conservation of energy, potential potential enstrophy, vorticity, mass, momentum, etc.) and non-reliable for calculating the impact since the impact is no longer based on traceable physics.

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

Even if you use AI to improve the physics calculations for both simulations (which will only take more computer time), the result is no longer correct, because the physical calculation was changed by a non-physical interpolation. cs.

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

The observations are the global surface air temperature change from 1901-1930 to 2015. web.stanford.edu/group/efmh/j... Such cause and effect can never be shown or validated with AI because AI cannot simulate a world physically without ACOS, AAP, or the UHI.

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

Here's a more specific example. GATOR-GCMOM, arguably the most complex and advanced computer model of any kind web.stanford.edu/group/efmh/j... is used to show, by cause-and-effect, the observed impact of anthropogenic CO2 + anth aerosol particles + urban heat island effect on global climate

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

AI can give you future estimates of the current atmosphere (ignoring the accuracy) but can't give you any future prediction of the current atmosphere without CO2 since there are no data available to train it without CO2.

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 17/09/2026

Here is an example of how AI cannot be used to determine cause and effect. Suppose you want to know the impact of CO2 on climate. With a physics model, you run two simulations, one with the current atmosphere and a second with the current atmosphere but without CO2.

web.stanford.edu

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

So training people simply to use AI and not to learn physics, chemistry, biology, etc. deprives future generations the ability to solve many problems that AI will never solve because it is not and cannot be designed to solve these problems.

science.org

Physics-based models outperform AI weather forecasts of record-breaking extremes

Physics-based models still outperform artificial intelligence-based weather models in forecasting record-breaking extreme events.

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

AI has its limits. It is not so good as physical models for predicting weather extremes www.science.org/doi/10.1126/... has little ability to predict normal weather past 15-30 days or determine cause & effect like a physical model, so no ability to predict impacts of chemicals on future climate.

science.org

Physics-based models outperform AI weather forecasts of record-breaking extremes

Physics-based models still outperform artificial intelligence-based weather models in forecasting record-breaking extreme events.

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

I'm posting this because there are still people pretending publicly the Clack paper was just a normal science article when the only legal ruling on this issue with evidence, witnesses, and testimony was the paper had false facts & abnormal criticism that went far beyond debate x.com/mzjacobson/s...

x.com

Mark Z. Jacobson (@mzjacobson) on X

You should do your research before making bogus claims. I won the only legal case that included evidence, a trial, and witnesses, and this ruling can never be appealed. The trial in that case justifie...

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

Lower maximum whole sale price means it is easier to match demand with supply on the grid.

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

Hello. What happened to all the trolls claiming that renewables increase electricity prices and destabilize grids?

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

The more WindWaterSolar, the more reliable a grid in terms of matching supply with demand. Data show more WWS as a fraction of grid electricity demand reduces not only retail electricity prices with statistical significance but also max annual wholesale prices with statistical significance.

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Mark Z. Jacobson @mzjacobson.bsky.social · 15/09/2026

After the worst heat of the year, fossil gas use is still 48% lower in 2026 than in 2023 and has supplied only 20% of all electricity in 2026 versus 39% in 2023. 189th >100% WWS day of 2026. 56.3% of all electricity during the year has been from WWS.

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Mark Z. Jacobson @mzjacobson.bsky.social · 13/09/2026

WWS supply has now exceeded 100% of demand on the California ISO grid for 18.5% of all hours in 2026. 56.2% of all demand in 2026 has been met by WWS. 187th 100% WWS day of the year on Sat, Sep. 13. WindWaterSolar continues to provide stable output in California, even through heat waves.

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Mark Z. Jacobson @mzjacobson.bsky.social · 06/09/2026

Still No Miracles Needed is correct. Existing technologies can solve our climate, pollution, and energy security problems.

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Mark Z. Jacobson @mzjacobson.bsky.social · 05/09/2026

WindWaterSolar continues to meet >100% of demand for part of 6th straight day (and 185th of 247 in 2026) in CA Solar up 53%, wind up 21%, batteries up 319%, gas down 49% 2026 v 2023 Gas meeting only 19.57% of demand, vs 38.75% in '23 57% of all demand met with WWS 2026 Avg 4.4 h/day with>100% WWS

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Mark Z. Jacobson @mzjacobson.bsky.social · 04/09/2026

This is how fast oil use can disappear China's reduction in oil consumption during first half of 2026 due to replacement of fossil vehicles with EVs exceeded the UK’s entire oil consumption during that period China’s CO2 emis fall Q226 due to plummeting oil use carbonbrief.org/analysis-chi...

carbonbrief.org

Analysis: China’s CO2 emissions fall in Q2 2026 due to plummeting oil use - Carbon Brief

China’s carbon dioxide (CO2) emissions fell by 1% in the second quarter of 2026, as oil consumption plummeted amid the strait of Hormuz crisis.

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Mark Z. Jacobson @mzjacobson.bsky.social · 06/09/2026

Still No Miracles Needed is correct. Existing technologies can solve our climate, pollution, and energy security problems.

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Mark Z. Jacobson @mzjacobson.bsky.social · 05/09/2026

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Mark Z. Jacobson @mzjacobson.bsky.social · 03/09/2026

The strong correlation between WindWaterSolar and lower US electricity prices is not due to random chance Multiple statistically-significant regression lines indicate that, above 10% WWS supply relative to grid+behind-the-meter demand, the correlation between more WWS and lower prices is not random

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Mark Z. Jacobson @mzjacobson.bsky.social · 04/09/2026

EV's use 1/4th the energy in electricity as ICEs use in gasoline or diesel, so even if electricity is from coal, energy use & CO2 emis decrease 75% with every EV. Plus, the intake fraction of vehicle exhaust is 25x that of power-plant exhaust, so human pollution mortality goes down 99% with an EV

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Mark Z. Jacobson @mzjacobson.bsky.social · 04/09/2026

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Mark Z. Jacobson @mzjacobson.bsky.social · 04/09/2026

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