I'd like to announce an exciting new postdoc position we just opened up to work on new approaches to indirect land use change assessment and risk mitigation. Please share through your networks! its.ucdavis.edu/about-us/car...

Lovely new blog by @auffhammer.bsky.social, who clearly enjoyed a full helping of snark this Thanksgiving! energyathaas.wordpress.com/2025/12/01/a... I 100% agree, I have a Ph.D. in this stuff and I can't understand half of my bill (except the total I owe, they're great at making that clear)

Interested in the GREET model for transportation LCA? Have you found the GREET model to be very confusing and tough to work with? We can help with that! ITS-Davis will host a 2-day R&D GREET model training workshop model in Sacramento this November, I'll be your instructor! conta.cc/4lfRBoP

good morning, short thread on the raids in Camarillo, Ventura County, California. Friends of mine were tear gassed and fired upon with "less lethal" bullets for showing up with a bullhorn. They carted away busloads of farmworkers. Families torn apart. Children sobbing. This is Trump's America.

I just donated! RL Miller is the real deal. She shows up when things are tough.

True. The way to establish the water level a X year flood will hit is to watch that body of water over many 100's of years, or longer. You can't really do that while the climate is actively and significantly changing. We can model approximations, but our models are also in uncharted territory.

I have a new blog up at the UC Davis Institute of Transportation Studies: No, Your Gasoline Prices Will Not Rise by 65 cents per gallon in July. I'll give you three guesses to figure out what it's about. its.ucdavis.edu/blog-post/no...

🌎 On #EarthDay, join us for our fourth annual #CAClimateSummit. Register: theclimatecenter.org/summit2025 With policy experts, elected officials, business leaders, scientists, and activists, we'll explore how to draw down carbon and build resilience for a climate-safe future.

Lots of people saying, "just wait until the consequences hit!" I would remind you that last time Trump was president, he botched a pandemic & a million Americans died. As a result, he was reelected & Americans turned on their own public health agencies.

Credit where it's due: This is a sensible decision we should have made long ago: www.nytimes.com/2025/02/09/u...

I wonder if we should be thinking of Musk's seizing of Treasury as an historic cyber-security breach that endangers the entire US and global financial system. Every government and financial institution in the world should be demanding that Treasury arrest the hackers, restore integrity of US govt.

Elon Musk illegally seized the purse strings of the United States. An unelected billionaire may have access to everyone’s social security numbers.   We need answers now. This power grab cannot stand.

And once again, Democrats focus on winning past elections, not the upcoming ones.

Totally agree with this. Killing subsidies will slow the transition, not stop it. The fundamental advantages of battery-electric powertrains for light and medium duty applications are too great; some will cheaper than their ICE equivalents in the US even without subsidies within 20 years.

Trump just literally eliminated an Executive Order to reduce the price of prescription drugs. They are ripping you off, personally. They never gave a shit about the price of anything.

Well that will surely teach Trump a valuable lesson and reassure all that we are a nation of laws, not of kings.

I have so much to say about this...and will. But for now: the problem is not just with economics (and whether we can do better), but rather the declining influence of objective analysis in our society. 1/ #EconSky

This wouldn't be a perfect solution, from the analytical perspective, but clearly a big step forward from the current approach.

My father would womanize, he would start land wars with Denmark. He would make outrageous claims like claiming ownership of Greenland. Sometimes he would refer to the Gulf of Mexico as the Gulf of America.

-51 gCO2e/MJ seems like a pretty reasonable number for livestock digesters in the short term, e.g. the 10 year period the credits are authorized for (caveat: I haven't seen the math Treasury and DOE did to arrive at this number, but I have been reading a lot of livestock digester LCAs recently).

I really wish we saw more emphasis on installing 120V outlets everywhere (at rental properties, public garages, workplace parking lots etc). If you were confident you could slow charge wherever you park, it would be fine for maybe 80-90% of days, with DC rapid chargers filling in the rest of time.

We gotta reject “Well, RFK jr. is right about some things” and accept “if we don’t confront the real problems with our systems, it becomes much easier for con artists like this guy to manipulate people.”

Happy New Year, Bluesky! I wanted to start the year with an example of the best science communication I've seen in... a while. Apologies for the fact that it's on a paywalled site (though @economist.com is one of my preferred sources for high-quality journalism) www.economist.com/interactive/...

The tide seems to be slowly turning against hydrogen fuel cell vehicles, and now one of the standard-bearers seems to be going through even more turmoil. Luckily, batteries keep getting lighter, cheaper, and quicker to charge so there are other ZEV options in the heavy-duty space.

This is absolutely critical to our progress towards GHG reduction. It's strange that it took this long, and frustrating that several other critical rules, notably Advanced Clean Fleets, are still pending (and seem unlikely to be granted, unfortunately) but this is a big one on that front.

This is so spot on. As a climate scientist and public intellectual, I see or experience these often

A lot of academics (myself included) are activists. Studying something horrible (you know, like climate change or gender inequality) and wanting to make it less horrible doesn’t mean your work is compromised — it just means you give a shit. Empathy is a key scholarly skill. IMHO.

Transportation Annual Technology Baseline (ATB) 2024 is out! - includes updated cost and performance data for vehicle and fuel technologies to help stakeholders plan transportation future Register for the Dec 3 webinar. www.energy.gov/eere/analysi... #energysky

Donald Trump is about to do to the economy what he did to the Capitol.

Good overview of SAF from @mariagallucci.bsky.social in Canary Media. My only quibble is that I probably would have spent more time unpacking the uncertainty around carbon intensity assessment and point out that the DOE estimates (from GREET) may be a bit low www.canarymedia.com/articles/air...

Many modeling studies depend on direct air capture (DAC) in their 1.5°C stabilization scenarios, but they rely on overly optimistic assumptions regarding the cost and scaling of DAC systems. This leads to highly misleading results that impact the ability to reach climate stabilization goals.

*Sigh* I guess we're not done with high-volume, low-empirics advocacy around the LCFS impact on gas prices. Here I was hoping to be able to move on to other issues. I'm seeing news stories notably, including this one claiming massive LCFS-driven gas price increases www.newsweek.com/california-2...

Some positive #climate news for a change: Brazilian President Lula da Silva's efforts to curb deforestation is working: deforestation in the Amazon is down 30% since last year & 50% vs under Bolsonaro. Silva is expanding enforcement to stop net deforestation by 2030. www.reuters.com/world/americ...

I think this is right. Also, if anyone is looking for someone to blame, it should be focused on the people who looked exactly at what Trump was selling and said "yes."

Washington voters rejected a ballot initiative seeking to repeal the state’s cap-and-trade program. As of Wed morning, with more than 60% of expected votes counted, about 62% of voters opposed ballot initiative I-2117 while 38% supported it. Story @bloomberg.com: www.bloomberg.com/news/article...

Any remaining pretense that America is a just and compassionate force for good just crumbled. I weep for the millions doomed to suffer after this result. My heart hurts.

I would love a functional Green party in the U.S., even as a permanent minority, I'd probably vote for them. But our Green party doesn't engage in the work of governance. They run no local/state candidates, join no coalitions. They just pop up every presidential cycle to claim a bit of the spotlight

Trans rights are human rights

What’s scary to one can be comforting to another. #comic #webcomic

Yesterday, Trump raised the prospect of deploying the military against his political opponents. Extraordinary by any historical measure. Here are the front pages of 8 of the leading newspapers in the US the morning after. Nothing. Zero. Zip. Democracy dies in silence.

Saw this thread on the old platform (apologies for linking there, but I haven't found him here and want to offer credit where it's due) and have some thoughts. Thread: x.com/OilandGibbs/...

Yes, we do exist—and our numbers are growing. It’s not easy, because it means we get it from both sides: but we persist, because it matters so much! e.g., research finds framing climate action as a moral issue is a key societal tipping point. That's a natural role for people of faith. Read more:

Our team wrote up a rapid analysis of 2 rumors spreading that frame errors w/ absentee ballots as intentional voter suppression. We explain how those rumors are misleading: errors like that are rarely intentional, have remedies, and are unlikely to affect outcomes. uwcip.substack.com/p/d4ae631c-a...

Excellent blog on the value, and limitations of the proposed minimum gasoline inventory requirement.

This ⤵️

"Schemes to promote increased carbon uptake by plankton via iron fertilization of oceans will be less effective than previously believed." "Ocean iron fertilization is simply no longer to be taken as a viable option for mitigation of the CO₂ problem," [said] Hein de Baar 🌊

Many friends and colleagues gather in Ghent for the second ITS-Davis European Transport and Energy Research Center (ETERC) conference. I couldn't make it, but ETERC Director Pierpaolo Cazzola will present results from this recent study on US and EU policy towards alt fuels for aviation and shipping