Mark Z. Jacobson
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mzjacobson.bsky.social
Mark Z. Jacobson
@mzjacobson.bsky.social
4.2K followers 330 following 770 posts

Climate, pollution, clean/renewable energy
Stanford U Prof, Civil & Env Eng; Director, Atmos/Energy Program
Cofounder-Solutions Project; Appeared on Letterman
Testified Held v Montana

https://web.stanford.edu/group/efmh/jacobson/
Stanford.io/Jacobson .. more

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Mark Zachary Jacobson is a professor of civil and environmental engineering at Stanford University and director of its Atmosphere/Energy Program. He is also a co-founder of the non-profit, Solutions Project. .. more

Environmental science 27%
Public Health 16%
Posts Replies Media Videos

Reposted by Mark Z. Jacobson

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 1d
You are showing a graph of construction time, not planning-to-operation time. No nuclear reactor in the world has taken less than 10 years from P-to-O. In the last 7 years, that has increased to 12 years. In China, the range in 12-17 years. In North America and Europe, it is 15-23 years.

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 1d
EGS, which provides baseload electricity, eliminates the need for nuclear

EGS can be built from plan to operation in 3-5 y, v 12-23 y for nuc

EGS half the cost of nuc

EGS has no weapons prolif, meltdown, waste, underground U-mining lung-cancer, or CO2 risk as nuclear does

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 1d
Even in China, 12-17 years from plan to operation of new nuc

35 GW/15 years=2.3 GW/y, v 400 GW WWS in 2025 or 173x nuclear

CF of wind ~35%; hydro ~50%, CF of new utility PV 25% -> CF of WWS ~28%. CF of nuc ~90%, so new WWS producing 54x the output of new nuc

Reposted by Mark Z. Jacobson

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 1d
In 2024, China completed only 3.9 GW of nuclear, which is 1/95th the WWS completed. In 2025, the ratio will be even lower. Worldwide, nuclear output in 2024 was the same as in 2006. There is no growth in nuclear, and China is hardly building any vs WWS.

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 1d
Can Enhanced Geothermal Systems (EGS) Help Save Our Planet?

EGS is a clean, renewable technology that can satisfy world energy demand for all purposes upon electrification of most energy.

~25% of world land is suitable for EGS

www.youtube.com/shorts/BPykj...
Can Enhanced Geothermal Help Save Our Planet?
YouTube video by Mark Z. Jacobson
www.youtube.com

Reposted by Mark Z. Jacobson

Reposted by Mark Z. Jacobson

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 2d
4/4) Here is what a WWS system looks like
web.stanford.edu/group/efmh/j...
web.stanford.edu

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 2d
3/4) The US & India will get to 100% WWS only past 2130 at their current WWS growth rates.

Anyone who says transitioning to 100% WWS is not possible has their head in the sand. It is the only way to address climate, energy security & the 7.4 mil air pollution deaths/yr worldwide.

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 2d
2/4) China is also producing 150% of today's US electricity demand with just WWS.

China will be 100% WWS across all energy sectors, so eliminate 100% of its air pollution & GHG emissions from energy by 2051, IF it continues installing WWS at its 2025 pace & electrifies all energy.

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 2d
1/4) China is already generating, in 2025, from wind-water-solar (WWS) alone, 54% of all end-use energy the U.S. needs for all purposes (electricity, transport, buildings, industry) & 61% of the end-use energy India needs for all purposes in 2050.

Paper
pubs.rsc.org/en/content/a...

Reposted by Mark Z. Jacobson

Reposted by Mark Z. Jacobson

Reposted by Mark Z. Jacobson

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 3d
ABC news link to story
abcnews.go.com/Politics/tru...
Trump admin pauses leases for some offshore wind projects citing 'national security concerns'
The Trump administration is pausing five offshore wind projects due to national security concerns, Interior Secretary Doug Burgum announced on Monday.
abcnews.go.com

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 3d
On shortest day of year, Calif reaches 100% WindWaterSolar for part of 219th day in 2025

Fossil gas down 37.4% in '25 v '23
Batteries up 183% v '23
PV up 39.4% v '23
Wind up 4.4% v '23

51.7% of all in-state electricity from WWS v 44.7% in '23

CA will be 100% WWS 24/7 by 2039

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 3d
Good job, Trump, killing more people from fossil fuel pollution and sending the US further behind China, who is 100 years faster than us:

pubs.rsc.org/en/content/a...

Trump admin pauses leases for some offshore wind projects over national security concerns abcnews.go.com/Politics/tru...
Projections of when each of 150 countries May eliminate air pollution and carbon emissions from all energy
Whether the world addresses global warming, air pollution, and energy insecurity in a timely manner depends largely on country transition rates to clean, renewable energy. Yet, no study has examined t...
pubs.rsc.org

Reposted by Mark Z. Jacobson

Reposted by Mark Z. Jacobson

mzjacobson.bsky.social
Mark Z. Jacobson @mzjacobson.bsky.social · 4d
You are misrepresenting stated purpose of paper in the abstract, not digging heels

It's not a projection of what will happen, it's an estimate of when countries would reach 100% WWS across all sectors if current growth rates persist & countries electrify. Graph is exactly accurate for assumptions