Christoph Bertram

@christoph-bertram.bsky.social

950 followers 570 following 450 posts

Energy systems modeling & policy analysis - Associate Research Professor at Center for Global Sustainability, CGS @ctrglobsust.bsky.social at UMD @univofmaryland.bsky.social
German living and biking in DC, and with odd interest in basketball
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Economics 25%

Political science 22%

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Christoph Bertram @christoph-bertram.bsky.social · Sep 24

Great to see this product of work over the last half year with many great colleagues at @ctrglobsust.bsky.social launched.

What are possible high ambition emission pathways until 2035 for major countries, and their implications in the electricity sector and for fossil fuels? Find out 👇

Center for Global Sustainability @ctrglobsust.bsky.social · Sep 24

Just launched 📣
CGS's new flagship website on Country Climate Ambition offers critical insight for the Paris process through in-depth analyses and policy recommendations for major-emitting countries, as they set and seek to achieve ambitious 2035 #NDCs: www.country-ambition.cgs.umd.edu

A global map with colored dots indicating countries with analyses from a new CGS report. The text overlay reads: "Country Climate Ambition: High Ambition Pathways for National and Global Climate Goals; In the midst of the third round of the NDC cycle, the Center for Global Sustainability has launched a new flagship website on Country Climate Ambition, which provides in-depth analyses of plausible, high-ambition pathways and policy recommendations for 12 major-emitting countries towards 2035 and net-zero goals: Australia, Brazil, Canada, China, India, Indonesia, Japan, Mexico, Republic of Korea, and South Africa.

Reposted by Christoph Bertram

Cool Bike Art @coolbikeart1.bsky.social · 8h

❤️ every moment of this story

Experience: I cycled the length of the UK on a wooden bike

With no plans, I set off from John O’Groats to travel down south to Dover. Friends and family didn’t think I’d last a mile

www.theguardian.com

Reposted by Christoph Bertram

Richard Waite @waiterich.bsky.social · 5d

Days start getting longer on Monday

Christoph Bertram @christoph-bertram.bsky.social · 6d

For everyone traveling home from #AGU25, here something fitting to listen to, the final message dovetails nicely with one of my highlight take-home messages from this year:
"If you don’t stop, they really can’t stop you."
bsky.app/profile/agu....
And if you need a perfect nerd present:

Reposted by Christoph Bertram

David Ho @davidho.bsky.social · 6d

Summary of the news today

Wide, frontal view of a large, white marble modernist building under a clear blue sky. The façade is symmetrical, with a deep overhanging roof supported by tall, slender white columns evenly spaced across the front. Near the top of the wall, a horizontal row of narrow vertical slits forms a decorative grille. Centered across the façade is black lettering that reads on the bottom “THE JOHN F. KENNEDY MEMORIAL CENTER FOR THE PERFORMING ARTS,” with part of the text on top obscured by a black rectangle, redacting Donald Trump's name that was just added to the building. The building sits above a broad, dark platform, and the foreground shows light stone walkways and rectangular planters filled with neatly trimmed shrubs. Two small human figures stand near the base of the building.

Reposted by Flavio Lehner, Jonathan M. Gilligan, Christoph Bertram

Costa Samaras @costasamaras.com · 6d

On #AGVTV at #AGU25, Dr. Melissa Kenney and I talked about the opportunity for the entire scientific community to contribute towards climate assessment research. Submit your papers at USclimatecollection.org. youtu.be/7Kb-hfwIUxQ?...

Introducing the U.S. Climate Collection: Connecting Climate Science for a Brighter Future

YouTube video by WebsEdgeScience

youtu.be

Reposted by Nandita Sharma, Dorothy Bishop, Rosemary A. Joyce , and 7 more Nandita Sharma, Dorothy Bishop, Rosemary A. Joyce, Elizabeth Stokoe, Christoph Bertram, Cameron Campbell, Henry Farrell, Brian Keegan, Peter Gratton, Michael Gentile

Tim Dickinson @timdickinson.bsky.social · 6d

Some of these redactions are almost like modern art

Christoph Bertram @christoph-bertram.bsky.social · 7d

Shout-out to the bagpipes player welcoming attendees to the last day of #AGU25 in New Orleans

Christoph Bertram @christoph-bertram.bsky.social · 7d

Definitely going to this dance today. From 8-9pm there is a beginner lesson, which is a great way to get ready for the dance if you haven't done it before. The social dance starts at 9, and will be with live music. Walkable from #AGU25 . www.maisondupuy.com/live-music/ www.maisondupuy.com/dining/

Reposted by Paul Lehmann, Christoph Bertram

Wolf-Peter Schill @wpschill.bsky.social · 7d

How Germany generated its electricity in 2025 🇩🇪🔌↩️

💨💨💨💨💨💨💨💨💨💨
💨💨💨💨💨💨💨💨💨💨
💨☀️☀️☀️☀️☀️☀️☀️☀️☀️
☀️☀️☀️☀️☀️☀️☀️☀️🟠🟠
🟠🟠🟠🟠🟠🟠🟠🟠🟠🟠
🟠🟠🟠🟠🟤🟤🟤🟤🟤🟤
🟤🟤🟤🟤🟤🟤🟤🟤🟤🌽
🌽🌽🌽🌽🌽🌽🌽⚫⚫⚫
⚫⚫⚫🌊🌊🌊🌊🌊🇪🇺🇪🇺
🇪🇺🇪🇺💦💦💦🗑️🗑️🗑️🟢🛢️

💨 Onshore wind
☀️ Solar PV
🟠 Natural gas
🟤 Lignite
🌽 Biomass
⚫ Hard coal
🌊 Offshore wind
🇪🇺 Net imports
💦 Hydro
🗑️ Other
🟢 Bio waste
🛢️ Oil

Reposted by Garry Peterson, Christoph Bertram

Steven J. Davis @stevenjdavis.bsky.social · 8d

Thanks for noticing, Damian. In case useful, we also put together a research brief about the new paper here: drive.google.com/file/d/1ObuE...

Reposted by Katharine Hayhoe, Scott C. Doney, Ben Bond‐Lamberty , and 4 more Katharine Hayhoe, Scott C. Doney, Ben Bond‐Lamberty, Neil Pederson, Jennifer Pett‐Ridge, Christoph Bertram, Beth Tellman

Alexandra Witze @alexwitze.bsky.social · 8d

#AGU25 folks, there is a rapid- response town hall TODAY on the #NCAR dismantling at 1 pm, La Nouvelle Orleans ballroom C (per an AGU media advisory)

Reposted by Christoph Bertram

Brent Toderian @brenttoderian.bsky.social · 8d

Still not sure who did this, but it’s really good advice for cities.

Chalkboard with writing saying “Quote of the day: Don’t cling to a mistake just because you spent a long time making it.” – Unknown.

Reposted by Christoph Bertram

Center for Global Sustainability @ctrglobsust.bsky.social · 9d

This week CGS researchers are at #AGU25 to share research from our modeling and Indonesia programs. Learn more about how CGS's modeling and country climate work to support climate ambition in the NDC process: country-ambition.cgs...

A woman in formal wear stands at a podium with a laptop open while speaking to a crowd. Two people sit at a table next to her while a screen projecting news headlines takes up the right side of the photograph.

A man in a blue button up shirt stands at a podium with a computer while speaking to a crowd. Three people sit at a table next to him while a projected presentation is also positioned in front of the audience to the right of the speaker.

A man stands at a podium with a laptop and speaks to the crowd. Three people sit at a table next to the podium and look at the speaker or the projected presentation to the right of the speaker.

Christoph Bertram @christoph-bertram.bsky.social · 10d

Nice sunrise today to #AGU25 in New Orleans.
If you want to hear about the economic impact of the rise of low cost electric vehicles, go to room 271, session GC22C from 10.30am-12 today

Sunrise in New Orleans this morning, with Mississippi in front, and Crescent City connection bridge to the right

Christoph Bertram @christoph-bertram.bsky.social · 11d

Any lindy hop dancers 💃🕺 who go to #AGU25, and are on bluesky?

There seem to be 2 live music events this week, tonight (Sunday) at The Allways Lounge (45 min walking from NOMCC, see below)
and Thursday at Maison Dupuy (29 min walk, www.wwoz.org/events/1276446).
Let me know if you go!

Sunday Swing Night at the Allways Lounge

Dance lessons, then live music by some of the cities best local bands! Put on your dance shoes and come hang out where the locals do!

www.eventbrite.com

Christoph Bertram @christoph-bertram.bsky.social · 11d

Train travel also very convenient in that you can continuously post while traveling... that is a minus for the road trip option (although with an EV, the few extra minutes while stopping and charging help, I used all of those to text with friends and family...)

Yuxin Zhou @yzhouclimate.bsky.social · 12d

I’m taking the Amtrak from Atlanta to New Orleans for #AGU25! Follow my journey here, which will be 12.5 hours if there’s no delay 🚊

Christoph Bertram @christoph-bertram.bsky.social · 11d

Highlights were lunch in Knoxville with great colleague and friend David McColllum who unfortunately is not coming to #AGU25, and breakfast at a pieceful river, and the stars through the panoramic roof.
Full AGU scope covered: EV, seeing a Geminid shooting star, geological phenomena... 5/5

Cup of coffee and muffin on car window sill, with river and cloudy sunrise in background

David and Christoph in great Turkish Deli restaurant in Knoxville

Christoph Bertram @christoph-bertram.bsky.social · 11d

EV camp road trips are great, as you can heat the car without much noise while standing. My first night had lows at Natural Bridge in 20s F (-5°C), but I was comfortable and rewarded with the sunrise.
Normal charging breaks are only a bit longer (~20 min) than you anyway need for yourself...
4/n

Christoph Bertram @christoph-bertram.bsky.social · 11d

I left Friday after dinner, and will arrive at 3pm today. I did 200 miles on Friday, 600 yesterday and ~260 today. Even 600 was ok, despite many charging stops as the battery is relatively small and so winter range is only ~200 miles. The car is rented for 3 months via turo for 700$ a month 3/n

View of front seat equipped for road trips

Back of C40 with fully flat bed set-up for 6 ft (183 cm) tall person not requiring any change between driving and sleeping

Christoph Bertram @christoph-bertram.bsky.social · 11d

While 2 years ago when I did my other US multi-state EV roadtrip to Colorado in a Model 3, now you can luckily do this with any modern electric vehicle (EV) and I even managed to not rely at all on superchargers, but used a variety of charging options (right now a local one for 6ct/kWh) 2/n

Green Volvo C40 recharge twin in front of colorfull late fall trees

Christoph Bertram @christoph-bertram.bsky.social · 11d

1000 miles behind me, 53 left on my EV-camp-roadtrip from DC to New Orleans to give a talk on macroeconomic effects of EV policies at #AGU25

Interested in macro energy systems and GDP effects of climate policies -> GC22C-02 on Tuesday 10:30 CC271

Interested in EV (camp) road-tripping -> thread 1/5

Road sign saying
"Picayula 5
New Orleans 52" (miles)

Reposted by Christoph Bertram

Yuxin Zhou @yzhouclimate.bsky.social · 12d

I’m taking the Amtrak from Atlanta to New Orleans for #AGU25! Follow my journey here, which will be 12.5 hours if there’s no delay 🚊

Reposted by Christoph Bertram

AGU Distributed Sensing Technical Committee @agu-sensing.bsky.social · 13d

Heading to #AGU25? Here is a 🧵 of some useful resources to keep in mind! Be sure to check the meeting app "Helpful Information" section for the most up-to-date details & room numbers.

📸 Need a good indoor professional photo? Visit the Headshot Lounge, M-Th, in the Exhibit Hall.

1/🧵

Reposted by Christoph Bertram

Kelly Hereid @kellyhereid.bsky.social · 13d

*Busy* Monday for me at #AGU25

NH12B-05 11:12-11:22 Applying the Swiss Cheese Model to Wildfire Risk Management in the Built Environment

TH15B 6-7 Town Hall Hurricane Katrina 20 Year Later

then RUNNING to Atmos Science section Student/Early Career mixer to talk cat modeling 7-8:30

Christoph Bertram @christoph-bertram.bsky.social · Nov 9

He gets 350 km of range which lasts him a full day driving in Sao Paulo, not least thanks to recuperation going down its many hills. So far he charges for 2 hours during his lunch break but still loves it. Many nice features for the passengers: USB charging, cup holder, sliding door, coat hanger. /2

Seat with cup holder, tissue dispenser and USB charging ports

Seat with cup holder, tissue dispenser and coat hanger

View of dashboard showing a small speed indicator behind the wheel

Christoph Bertram @christoph-bertram.bsky.social · Nov 9

First ride in an electric taxi powered by Brazil's very clean electricity (see country-ambition.cgs.umd.edu/brazil#elect...). Just wow on how much space this offers inside for what from the outside even for European standards is a compact car. Very cheap according to yhe very friendly Rogerio 1/2

White battery electric compact car driving into a hotel driveway

183 cm tall passenger in the fond trying his best to sit as upright as possible bit still not reaching the roof

Same passenger can stretch his legs as much as he wants, while a carry-on suitcase has conveniently been rolled in through the automatic sliding door on the right.
Personally also like the orange handle to ease entry and exit for passengers with knee issues (incl. me)

Reposted by Christoph Bertram

Lauri Myllyvirta @laurimyllyvirta.bsky.social · Nov 9

China's formal submission of its new climate targets leaves out the commitment made in 2021 to gradually reduce coal consumption in 2026-30. It does reiterate the commitment to reduce carbon intensity, which is currently badly off track, but doesn't provide any progress update.

Reposted by Lesley A. Hall, Christoph Bertram

Kevin J. Kircher @kevinjkircher.com · Nov 9

The article doesn't say it, but this cool solar forecasting software uses no large language models, the thing people usually think of when they hear "AI." It uses a fairly simple convolutional neural network that's readily trained on a laptop. No data centers or LLMs involved. Research paper here:

Reposted by Neil Pederson, Christoph Bertram, Olúfẹ́mi Táíwò

Carole V. Bell @cvbell.bsky.social · Nov 8

Some much needed good news. “Jamaicans Have Been Turning to Solar Power. It Paid Off After the Storm.” Guft link: www.nytimes.com/2025/11/08/c...

Jamaicans Have Been Turning to Solar Power. It Paid Off After the Storm.

www.nytimes.com

Reposted by Christoph Bertram

Meade Krosby @meadekrosby.bsky.social · Nov 7

Hey all you might want to check your "require alt text" setting - mine got turned off and it sounds like it's happened to others, too (presumably with recent updates).

And if you've never done this, now's a good time:

Settings → Accessibility → Require alt text before posting

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