Ladd Keith @laddkeith.com · 29/09/2026Just curious, who else is heading to Bangkok for the GHHIN @heathealth.info #GlobalHeatForum? 001
Ladd Keith @laddkeith.com · 24/09/2026A day in the life of a planning professor. 😅 Stay tuned... 🐻⬇️ 040
Reposted by Ladd KeithAmerican Meteorological Society @ametsoc.org · 22/09/2026The first paper in the U.S. Climate Collection, an AMS-@agu.org initiative supporting assessment-ready climate science, is out! Published in #BulletinAMS & Earth’s Future, the paper highlights key needs for future climate assessments and decision-making. Read more: bit.ly/46CTg30 1128
Ladd Keith @laddkeith.com · 22/09/2026Big thank you to Melissa Kenney, @bobkopp.net, @costasamaras.com, and the rest of the author team for their work on this piece! 042
Reposted by Ladd KeithJesse M. Keenan @jessemkeenan.com · 22/09/2026I'm honored to contribute to this commentary w/ colleagues from across the United States. Big thank you to Melissa Kenney @costasamaras.com @bobkopp.net for their leadership & public service in the advancement of climate scholarship. READ HERE --> agupubs.onlinelibrary.wiley.com/doi/10.1029/... 0194
Reposted by Ladd KeithBob Kopp @bobkopp.net · 22/09/2026NEW PAPER: In a new paper, jointly published in @agu.org Earth's Future & @ametsoc.org BAMS, and co-led by Melissa Kenney, @costasamaras.com and me, 175 authors outline priorities to guide the future of scientific assessments of climate change in the United States. 🧵doi.orgResearch Priorities for Robust Climate Assessments in the United StatesA network of climate assessments plays a critical role in synthesizing the state of science to support evidence-based decision-making To support future U.S. and sub-national climate assessments, ... 114782
Ladd Keith @laddkeith.com · 22/09/2026Planners, public health officials, Tribes, and local governments relied on the NCA for decision-making, and right now nothing is filling that role. I'm proud of what we salvaged. Please read and share, and keep asking for a real National Climate Assessment. 231
Ladd Keith @laddkeith.com · 22/09/2026What it's not: a replacement for the National Climate Assessment. It doesn't include all vetted authors, has no public or National Academies review, and provides no findings for every region and sector. 121
Ladd Keith @laddkeith.com · 22/09/2026We also call for a network of national, regional, local, and sectoral assessments to keep synthesizing actionable science as impacts accelerate. 111
Ladd Keith @laddkeith.com · 22/09/2026Examples: compound extremes and cascading risks that overwhelm systems built for one hazard at a time, and the need to keep evaluating whether our climate responses work, including their health, economic, and environmental effects. 111
Ladd Keith @laddkeith.com · 22/09/2026What it is: a research priorities roadmap in AGU's Earth's Future. It identifies where the science has advanced since the 2023 NCA5 and where research is still needed. 111
Ladd Keith @laddkeith.com · 22/09/2026Remember the Sixth National Climate Assessment (#NCA6)? In April 2025, all of its authors were released, and the report was halted. I was a Southwest chapter author. Many of us former NCA6 authors just published what we could in its place. doi.org/10.1029/2025...doi.orgResearch Priorities for Robust Climate Assessments in the United StatesA network of climate assessments plays a critical role in synthesizing the state of science to support evidence-based decision-making To support future U.S. and sub-national climate assessments, ... 172
Ladd Keith @laddkeith.com · 19/09/2026I had the opportunity to be the closing speaker at the inaugural #PalmSprings Heat Summit this afternoon and share our research and resources for addressing extreme heat. I'm looking forward to see where their efforts take them next and to support them how I can! #extremeheat #heatresilience 061
Ladd Keith @laddkeith.com · 15/09/2026AI apocalypse aside, I just got my first AI agent email for an interview on extreme heat... I'm willing to bet these will overrun professor inboxes in short order. 🤖✉️ 060
Ladd Keith @laddkeith.com · 11/09/2026"The National Oceanic and Atmospheric Administration this week announced that for the Lower 48 states, this summer– from June to August– was the warmest in 132 years of record-keeping." www.npr.org/2026/09/10/n... #climatechange #extremeheatnpr.orgThis summer was hot. August shattered global heat recordsScientists say that August was the hottest month ever recorded globally. In the U.S., summer temperatures also shattered heat records. 074
Ladd Keith @laddkeith.com · 04/09/2026The full heat action plan report and evaluation tool are available for free at preparecenter.org/resource/eva...preparecenter.orgEvaluating the Implementation and Effectiveness of Heat Action PlansExtreme heat is a deadly and growing threat to cities worldwide. As recognition of heat risks increases, local governments have begun developing Heat Action Plans (HAPs) to outline goals, relevant inf... 010
Ladd Keith @laddkeith.com · 04/09/2026Cities are adopting heat action plans faster than ever. We still have almost no evidence that they work. In our new report, we coded 34 plans, evaluated 12 in depth, and interviewed officials. We found that cities track activities, not outcomes. heatshed.substack.com/p/we-dont-kn... #heatactionplanheatshed.substack.comWe don't know if heat action plans are workingA new international evaluation finds that cities track what they did, not what they changed. 240
Reposted by Ladd KeithPLOS Climate @plosclimate.org · 01/09/2026New research by Ashley Avila, Nicole Iroz-Elardo, Kristina Currans and @laddkeith.com: "A pilot study exploring the effect of vehicular waste heat on personal heat exposure in a semi-arid environment" journals.plos.org/climate/arti...journals.plos.orgA pilot study exploring the effect of vehicular waste heat on personal heat exposure in a semi-arid environmentUnderstanding the causes of heat in various microclimates in cities is vital to improving human thermal comfort and health in outdoor spaces. This pilot study uses an experimental design to evaluate m... 041
Ladd Keith @laddkeith.com · 24/08/2026"Just thinking in your own community, how many dedicated professionals do you have to extreme heat? Probably none." Check out my LinkedIn Live panel on Heat & Health: Co-Creating Resilience with Children & Communities hosted by ChildFund www.linkedin.com/eve... #extremeheat #heatresilience 001
Reposted by Ladd KeithLadd Keith @laddkeith.com · 05/08/2026📬 ICYMI: I started a newsletter. It's called Heatshed, and it's about how we plan for and govern extreme heat. I've written for journals and op-ed pages for years. This is where I get to think in public at the speed the problem moves. #extremeheat #heatshed #heatplanning #heatgovernance 152
Ladd Keith @laddkeith.com · 21/08/2026"Unfortunately, with climate change we'll continue to see these temperatures increase, and that's why these adaptive measures that the U of A's taking are so critical to keeping people safe." 010
Ladd Keith @laddkeith.com · 21/08/2026New interview with KVOA on how @uarizona.bsky.social kept students and their parents safe on move in day this week. www.kvoa.com/news/local/u... #extremeheat #universityofarizona #beardownkvoa.comU of A move-in 2026: Heat can't stop excitement for new WildcatsTUCSON, Ariz. (KVOA) - The University of Arizona welcomed nearly 1,500 students on one of the hottest move-in days in the school's history. 120
Reposted by Ladd KeithBrent Toderian @brenttoderian.bsky.social · 16/08/2026I’ve created a handful of them, but this might still be my most unusual STARTER PACK! A team-up with world famous climate scientist @katharinehayhoe.com, these are folks connecting the dots on climate action via better cities! Please follow these great folks and share the pack! go.bsky.app/7Wh2uvp 1319487
Ladd Keith @laddkeith.com · 14/08/2026Good to see a second state follow Arizona's lead with a state-level chief heat officer position! www.wbur.org/news/20... #extremeheat #heatresiliencewbur.orgMass. is second state to appoint heat resilience officerMassachusetts just appointed a heat resiliency officer to coordinate with state government agencies and work with communities to "prepare for rising temperatures, protect public health and reduce the impacts of extreme heat." 040
Ladd Keith @laddkeith.com · 08/08/2026“Climate change will manifest as a series of disasters viewed through phones with footage that gets closer and closer to where you live until you're the one filming it.” ... and the Catalinas behind me are on fire again from dry lightning. Photo in nighttime mode. #azwx #tucson #wildfire 1167
Ladd Keith @laddkeith.com · 07/08/2026Thanks to our other team members, Saeideh Sobhaninia, Halley Hughes, Maryam Shafiee Shakib, Alekzander Ryan, and Caroline Webster, for their work on the project. 000
Ladd Keith @laddkeith.com · 07/08/2026Check out our new report and the Heat Action Plan Implementation and Effectiveness (HAPIE) Tool we developed to help cities connect their heat goals to measurable outcomes! preparecenter.org/resource/eva... #extremeheat #heatactionplan #heatresilience #heatplanningpreparecenter.orgEvaluating the Implementation and Effectiveness of Heat Action PlansExtreme heat is a deadly and growing threat to cities worldwide. As recognition of heat risks increases, local governments have begun developing Heat Action Plans (HAPs) to outline goals, relevant inf... 110
Ladd Keith @laddkeith.com · 07/08/2026Over the years, @sarameerow.bsky.social and I have evaluated many plans to see how well they address extreme heat. In this Global Disaster Preparedness Center project, we explored how heat action plans are actually being implemented and asked officials about their perceived effectiveness. 110
Ladd Keith @laddkeith.com · 05/08/2026Two posts so far: "What is a 'heatshed'?" Where the term came from, and why heat needs a shared geography the way water does. "Air conditioning is not a guarantee for heat protection." Why 90% AC adoption measures equipment, not protection. heatshed.substack.com #heatshed #heatresilienceheatshed.substack.comHeatshed | Ladd Keith | SubstackHow we plan for and govern extreme heat. Click to read Heatshed, by Ladd Keith, a Substack publication. Launched 6 days ago. 000
Ladd Keith @laddkeith.com · 05/08/2026📬 ICYMI: I started a newsletter. It's called Heatshed, and it's about how we plan for and govern extreme heat. I've written for journals and op-ed pages for years. This is where I get to think in public at the speed the problem moves. #extremeheat #heatshed #heatplanning #heatgovernance 152
Ladd Keith @laddkeith.com · 02/08/2026"Those who can install air conditioning in Europe and across the world will increasingly do so, so let’s make sure we don’t leave behind those who cannot." 020
Ladd Keith @laddkeith.com · 02/08/2026"So the United States’ lesson for Europe isn’t simply “install units.” It’s that our high adoption rate measures equipment, not necessarily protection, and a country can reach 90% and still not protect everyone." 100
Ladd Keith @laddkeith.com · 02/08/2026📬 Wrote a new post for my Heatshed newsletter on air conditioning in Europe and the U.S. and lessons we can learn from each other. I'll post monthly after this, but I had been mulling this one over all summer! heatshed.substack.com/p/air-condit... #airconditioning #extremeheat #heatwaveheatshed.substack.comAir conditioning is not a guarantee for heat protectionWhat Europe and the United States can learn from each other after this summer's heatwaves. 121
Ladd Keith @laddkeith.com · 30/07/2026My hope is that this will be a faster and more conversational venue to write about extreme heat than my journal articles. 010
Ladd Keith @laddkeith.com · 30/07/2026"That is what a “heatshed” names. It’s the physical and policy scale at which heat actually operates, and therefore the scale at which it has to be planned for and governed." 110
Ladd Keith @laddkeith.com · 30/07/2026I started a Substack on heat planning and governance! "The causes of extreme heat exceed political boundaries, and the solutions to address it must span sectors and levels of government." Read more and subscribe at heatshed.substack.com/p/what-is-a-... #extremeheat #heatshedheatshed.substack.comWhat is a "heatshed"?What a heatshed is, where the term came from, and what this newsletter will be 112
Ladd Keith @laddkeith.com · 28/07/2026 "We continue to see these record-breaking heatwaves, [but] they’re still treated like one-off events." 000
Ladd Keith @laddkeith.com · 28/07/2026🎙️ICYMI: I joined Doug Parsons on the latest episode of the @americaadapts.bsky.social podcast, where we discuss the latest developments in adapting to extreme heat. www.americaadapts.org/episodes/ext... #extremeheat #heatresilience #climateadaptation #climatechangeamericaadapts.orgExtreme Heat: The Deadliest Climate Hazard Is Also the Most Invisible with Dr. Ladd Keith — AMERICA ADAPTS The Climate Change PodcastExtreme Heat: The Deadliest Climate Hazard Is Also the Most Invisible with Dr. Ladd Keith. Ep. 257. 114
Ladd Keith @laddkeith.com · 27/07/2026"‘Extraordinarily hot’: US heatwave stretches on with millions still under warnings" www.theguardian.com/... #extremeheat #heatwavetheguardian.com‘Extraordinarily hot’: US heatwave stretches on with millions still under warningsSouthern and central states from California to Mississippi face heat indexes above 100F amid another heat dome 020
Ladd Keith @laddkeith.com · 24/07/2026"Japan this week recorded its first kokushobi, a term that means “cruel heat day,” as temperatures reached 104 degrees. It is not the only country that has scrambled for a new summer vocabulary." www.nytimes.com/2026/07/23/w...nytimes.comIt’s So Hot That Japan Needs a New Word for ItJapan this week recorded its first kokushobi, a term that means “cruel heat day,” as temperatures reached 104 degrees. It is not the only country that has scrambled for a new summer vocabulary. 063
Ladd Keith @laddkeith.com · 24/07/2026I recently spoke with the Arizona Farm Bureau about rural heat resilience: “Cities have advanced cooling centers, cool pavement and urban greening. But those might not be best strategies for rural farming communities.” www.azfb.org/Article/What... #heatresilience #ruralheat #extremeheatazfb.orgWhat Science Tells Us About Working in Arizona’s HeatAs the push for regulation intensifies, it’s important to understand what we know — and don’t — about farm and ranch work in extreme heat. 001
Ladd Keith @laddkeith.com · 23/07/2026I joined NPR affiliate @wosupublicmedia.bsky.social All Sides with Amy Juravich this morning to discuss extreme heat and heat resilience - timely, as Ohio experienced a record-breaking heatwave last month. Catch the full live interview at www.wosu.org/show/all-sid... #extremeheat #heatresiliencewosu.orgLearning heat resilience during extreme temperaturesThe dog days of summer are upon us. There are ways communities can deal with extreme heat, but it takes a systemic approach. We take a look at heat resilience and what it takes to build heat-resilient... 020
Reposted by Ladd KeithUofA Heat Resilience Initiative @heatresilience.bsky.social · 23/07/2026Our July newsletter is now available featuring rural heat planning, heat resilience news coverage, and important upcoming events. Subscribe to the newsletter by visiting heat.arizona.edu. ☀️ #extremeheat #heatresilience Read it now, here: view.comms.arizona.edu?vawpToken=IQ... 033
Ladd Keith @laddkeith.com · 22/07/2026I also discuss three steps all cities can start with to address extreme heat: 1) Appoint someone with responsibility, 2) Set goals, priorities, strategies, and evaluation metrics, and 3) Coordinate and collaborate across sectors and levels of government. 010
Ladd Keith @laddkeith.com · 22/07/2026New in-depth Q&A with Smart Cities Dive: "Our cities were built for a climate that no longer exists." www.smartcitiesdive.com/news/extreme... #extremeheat #heatresilience #heatgovernancesmartcitiesdive.com3 steps on extreme heat every city should takeBetter governance, stronger partnerships and a solid action plan are key to protecting residents from soaring temperatures, this heat resilience expert says. 110
Ladd Keith @laddkeith.com · 21/07/2026🎙️Check out the latest episode of the @americaadapts.bsky.social podcast, where Doug and I discuss the latest developments in adapting to extreme heat! #extremeheat #climateadaptation #climatechange #heatresilience 033
Ladd Keith @laddkeith.com · 20/07/2026Co-authored by Sara Meerow, Anne-Lise Boyer, and Minwoo Ahn 000
Ladd Keith @laddkeith.com · 20/07/2026📢 Heat impacts all communities, not just large cities. In our new American Planning Association PAS Memo, we explain the need for rural heat resilience and outline actionable principles and strategies for rural communities and small towns. www.planning.org/pub... #extremeheat #heatresilience 134
Ladd Keith @laddkeith.com · 20/07/2026"We have to shift away from planning for the historic heat we've experienced and start to plan for the heat we're going to experience in the next five to 10 years." #heatresilience 021
Ladd Keith @laddkeith.com · 20/07/2026Quoted in this BBC News piece about lessons from Arizona in addressing extreme heat: "It's incredibly important to make someone responsible for heat because the problem is, if it's no one's responsibility, then no one will address it." www.bbc.com/news/art... #extremeheat #climatechangebbc.comWhat Phoenix can teach the world about tackling heat deathsMaricopa County in Arizona has some of the hottest temperatures, but it has reduced the number of heat-related deaths. 152