Christoph Bertram

@christoph-bertram.bsky.social

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 Views my own

And yes in the 20th century the fossil economy has fueled crucial human development, no doubt. But let’s please not pretend that the biz folks profiting from fossil ownership have not weaponized it, or that *in a normal edu/media enviro* people blindly assume they do not come with bad externalities

Keeping these 2 sources of opposition independent from each other assumes that climate-forcing lobbies are genuinely only worried about how to get cleaner on their terms; but that’s only true of some ff-adjacent industries: as colleagues have shown, ff is treating climate as an existential battle.

much agreement with this 🧵 but pol science has clearly shown that ideologically opposition to clean energy is a direct function of political efforts in fossil fuels sectors and constituencies to generate such ideology. So no, fossil lobbying for their interests and culture wars are not separate.

Zeke Hausfather@zekehausfather.com · 4w ago

While I agree with Bill that the fossil fuel lobby paid for a lot of climate denial in previous decades, I see ideological opposition to clean energy (and climate action) as a much bigger barrier to progress today than fossil lobbyists.

A continuity of conflict, 1776-2026 I wrote about how to approach a history that is complicated, inspiring, frustrating, uplifting, and horrifying – all at once, all the time. From the Declaration to Donald Trump. Some thoughts from my new piece (no paywall - please consider subscribing): 🧵

From the Declaration to Donald Trump

Wrestling with a history that is complicated, inspiring, frustrating, uplifting, and horrifying. A continuity of conflict, 1776-2026

steady.page

The UK doesn't yet have that much solar capacity, and neither does France; but even so, imagine the power grid last week if it *hadn't* had that big solar chunk (this is France last Tuesday, during a scorcher; at 2pm, load was 57GW and solar was 19.5GW).

Chart of power demand, supply and load for France on June 22 and 23 2026, during an extreme heatwave. Source is BloombergNEF. The power mostly came from nuclear, but there's a substantial chunk of power coming from solar during the daytime.

🎉 Release 3.4 of our Python package pyam for scenario analysis & data visualisation New features: 1. Aggregate Kyoto-GHG using different GWP metrics 2. Improved support for datetime & categorical subannual timeseries data 3. Integration with latest version of ixmp4 database package #pyam_iamc 🔌💡

GitHub - IAMconsortium/pyam: Analysis & visualization of energy & climate scenarios

Analysis & visualization of energy & climate scenarios - IAMconsortium/pyam

github.com

"Cleaner is cheaper" hasn't broken through in part because it wasn't true until 5-10 years ago. For decades before then, cleaner was more expensive. We even have words for it, like "green premium." Republicans (& some corporate Democrats) are using that misunderstanding to weaken or gut policy..

Economics - this discipline so many climate folks love to hate. James Rising and I have a chapter out today in the Handbook of Climate Economics summarizing and evaluating some of these "constructive critiques" www.sciencedirect.com/science/chap...

Critical perspectives on climate change economics

Economists have been engaged with the climate change problem for 50 years. Economic thought, particularly the advantages of emissions pricing policies…

sciencedirect.com

Fully agree, but want to be really very specific here: Using RCP8.5 forcing and temperature still has value as a high emissions, high climate sensitivity climate outcomes & for impacts. Using the IAM output (energy, land use) from SSP5-8.5 however really should be discouraged as outdated.

Flavio Lehner@climateflavors.bsky.social · 3mo ago

If you're a reviewer or an editor for a scientific journal, I urge you to not hop on the "RCP8.5 is dead" train. There are now editors that reject RCP8.5 but are ok with 1pctCO2. 🤯 Both are what-if scenarios, useful to science. Don't let politics influence what we can research and publish! 1/3

👀👀👀 the UN general assembly has backed the ICJ climate opinion – despite opposition from the US & 7 others (Russia, Saudi, Iran, Belarus, Liberia, Yemen & Israel) Also a notable abstention from COP31 host Turkey

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While chatting with some friends, it occurred to me that other people could benefit from a summary understanding of what's going on in the oil and gas markets. Here are some little pictures to give you the big picture. 🧵

Born in fire, battered by the wreckage of colliding worlds, covered for eons in magma, wracked by volcanoes, frozen and thawed again and again, and after everything went just wrong and right enough, here it is: our home. The rarest gift in the known universe. Happy Earth Day.

A photo of Earth taken by the crew of Artemis II.

Solar's 636 TWh rise was the largest structural single year increase of any electricity source ever. The only larger rise was coal's 2021 rebound from the Covid-19 pandemic in 2020. Solar had the biggest absolute increase of any source in each of the last four years.

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NEW | Clean power met ALL the growth in global electricity demand in 2025 Solar generation alone met THREE QUARTERS of the demand rise and grew by 30%. Fossil generation stagnated (-0.2%). 🧵 A thread on changes in the global power system in 2025...

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Ember@ember-energy.org · 4mo ago

NEW | Solar power surge in 2025 stalls rise in fossil electricity worldwide ⚡📈 Clean power growth outpaced global electricity demand last year – with solar alone supplying THREE-QUARTERS of the increase in demand ☀️ ember-energy.org/lat...

I'm not sure if this is controversial, but I declare electric vehicles as the most inevitable clean technology - more so even than techs with higher current adoption, such as wind or solar. As my mentor used to say: "it's all over but the shouting", though most people don't realize it.