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Money is pouring in — and deadlines are approaching fast.
There’s no quick fix for decarbonizing medium- and long-distance flights. Batteries are typically too heavy, and hydrogen fuel takes up too much space to offer a practical solution, leaving sustainable aviation fuels made from plants and other biomass, recycled carbon, or captured carbon as the primary options. Traditionally, this fuel is much more expensive — and the feedstocks for it much more scarce — than conventional petroleum-based jet fuel. But companies are now racing to overcome these barriers, as recent months have seen backers throw hundreds of millions behind a series of emergent, but promising solutions.
Today, most SAF is made of feedstocks such as used cooking oil and animal fats, from companies such as Neste and Montana Renewables. But this supply is limited by, well, the amount of cooking oil or fats restaurants and food processing facilities generate, and is thus projected to meet only about 10% of total SAF demand by 2050, according to a 2022 report by the Mission Possible Partnership. Beyond that, companies would have to start growing new crops just to make into fuel.
That creates an opportunity for developers of second-generation SAF technologies, which involve making jet fuel out of captured carbon or alternate biomass sources, such as forest waste. These methods are not yet mature enough to make a significant dent in 2030 targets, such as the EU's mandate to use 6% SAF and the U.S. government’s goal of producing 3 billion gallons of SAF per year domestically. But this tech will need to be a big part of the equation in order to meet the aviation sector’s overall goal of net zero emissions by 2050, as well as the EU’s sustainable fuels mandate, which increases to 20% by 2035 and 70% by 2050 for all flights originating in the bloc.
“That’s going to be a massive jump because currently, SAF uptake is about 0.2% of fuel,” Nicole Cerulli, a research associate for transportation and logistics at the market research firm Cleantech Group, told me. The head of the airline industry’s trade association, Willie Walsh, said in December at a media day event, "We’re not making as much progress as we’d hoped for, and we’re certainly not making as much progress as we need.” While global SAF production doubled to 1 million metric tons in 2024, that fell far below the trade group’s projection of 1.5 million metric tons, made at the end of 2023.
Producing SAF requires making hydrocarbons that mirror those used in traditional jet fuel. We know how to do that, but the processes required — electrolysis, gasification, and the series of chemical reactions known as Fischer-Tropsch synthesis — are energy intensive. So finding a way to power all of this sustainably while simultaneously scaling to meet demand is a challenging and expensive task.
Aamir Shams, a senior associate at the energy think tank RMI whose work focuses on driving demand for SAF, told me that while sustainable fuel is undeniably more expensive than traditional fuel, airlines and corporations have so far been willing to pay the premium. “We feel that the lag is happening because we just don’t have the fuel today,” Shams said. “Whatever fuel shows up, it just flies off the shelves.”
Twelve, a Washington-based SAF producer, thinks its e-fuels can help make a dent. The company is looking to produce jet fuel initially by recycling the CO2 emitted from the ethanol, pulp, and paper industries. In September, the company raised $645 million to complete the buildout of its inaugural SAF facility in Washington state, support the development of future plants, and pursue further R&D. The funding includes $400 million in project equity from the impact fund TPG Rise Climate, $200 million in Series C financing led by TPG, Capricorn Investment Group, and Pulse Fund, and $45 million in loans. The company has also previously partnered with the Air Force to explore producing fuel on demand in hard to reach areas.
Nicholas Flanders, Twelve’s CEO, told me that the company is starting with ethanol, pulp, and paper because the CO2 emissions from these facilities are relatively concentrated and thus cheaper to capture. And unlike, say, coal power plants, these industries aren’t going anywhere fast, making them a steady source of carbon. To turn the captured CO2 into sustainable fuel, the company needs just one more input — water. Renewable-powered electrolyzers then break apart the CO2 and H2O into their constituent parts, and the resulting carbon monoxide and hydrogen are combined to create a syngas. That then gets put through a chemical reaction known as “Fischer-Tropsch synthesis,” where the syngas reacts with catalysts to form hydrocarbons, which are then processed into sustainable jet fuel and ultimately blended with conventional fuel.
Twelve says its proprietary CO2 electrolyzer can break apart CO2 at much lower temperatures than would typically be required for this molecule, which simplifies the whole process, making it easier to ramp the electrolyzers up and down to match the output of intermittent renewables. (How does it do this? The company didn’t respond when I asked.) Twelve’s first plant, which sources carbon from a nearby ethanol facility, is set to come online next year, producing 50,000 gallons of SAF annually once it’s fully scaled, with electrolyzers that will run on hydropower.
While Europe may have stricter, actually enforceable SAF requirements than the U.S., Flanders told me there’s a lot of promise in domestic production. “I think the U.S. has an exciting combination of relatively low-cost green electricity, lots of biogenic CO2 sources, a lot of demand for the product we’re making, and then the inflation Reduction Act and state level incentives can further enhance the economics.” Currently, the IRA provides SAF producers with a baseline $1.25 tax credit per gallon produced, which gradually increases the greener the fuel gets. Of course, whether or not the next Congress will rescind this is anybody’s guess.
Down the line, incentives and mandates will end up mattering a whole lot. Making SAF simply costs a whole lot more than producing jet fuel the standard way, by refining crude oil. But in the meantime, Twelve is setting up cost-sharing partnerships between airlines that want to reduce their direct emissions (scope 1) and large corporations that want to reduce their indirect emissions (scope 3), which include employee business travel.
For example, Twelve has offtake agreements with Seattle-based Alaska Airlines and Microsoft for the fuel produced at its initial Washington plant. Microsoft, which aims to reduce emissions from its employees’ flights, will essentially cover the cost premium associated with Twelve’s more expensive SAF fuel, making it cost-effective for Alaska to use in its fleet. Twelve has a similar agreement with Boston Consulting Group and an unnamed airline
Eventually, Flanders told me, the company expects to source carbon via direct air capture, but doing so today would be prohibitively expensive. “If there were a customer who wanted to pay the additional amount to use DAC today, we'd be very happy to do that,” Flanders said. “But our perspective is it will maybe be another decade before that cost starts to converge.”
No sustainable fuel is even close to cost parity yet — Cerulli told me that it generally comes with a “roughly 250% to over 800%” cost premium over conventional jet fuel. So while voluntary uptake by companies such as Microsoft and BCG are helping drive the emergent market today, that won’t be near enough to decarbonize the industry. “At the simplest level, the cost of not using SAF has to be higher than using it,” Cerulli told me.
Pathway Energy thinks that by incorporating carbon sequestration into its process, it can help the world get there. The sustainable fuels company, which emerged from stealth just last month, is pursuing what CEO Steve Roberts told me is “probably the most cost-efficient long-term pathway from a decarbonization perspective.” The company is building a $2 billion SAF plant in Port Arthur, Texas designed to produce about 30 million gallons of jet fuel annually — enough to power about 5,000 carbon-neutral 10-hour flights — while also permanently sequestering more than 1.9 million tons of CO2.
Pathway, a subsidiary of the investment and advisory firm Nexus Holdings, has partnered with the UK-based renewable energy company Drax, which will supply the company with 1 million metric tons of wood pellets, to be turned into fuel using a series of well-established technologies. The first step is to gasify the biomass by heating the pellets to high temperatures in the absence of oxygen to produce a syngas. Then, just as Twelve does, it puts the syngas through the Fischer-Tropsch process to form the hydrocarbons that become SAF.
The competitive advantage here is capturing the emissions from the fuel production process itself and storing them permanently underground. Since Pathway is burying CO2 that’s already been captured by the trees from which the wood pellets come, that would make Pathway’s SAF carbon-negative, in theory, while the best Twelve and similar companies can hope for is carbon neutrality, assuming all of their captured carbon is used to produce fuel.
The choice of Drax as a feedstock partner is not without controversy, however, as the BBC revealed that the company sources much of its wood from rare old-growth forests. Though this is technically legal, it’s also ecologically disruptive. Roberts told me Drax’s sourcing methodologies have been verified by third parties, and Pathway isn’t concerned. “I don't think any of that controversy has yielded any actually significant changes to their sourcing program at all, because we believe that they're compliant,” Roberts told me. “We are 100% certain that they’re meeting all the standards and expectations.”
Pathway has big growth plans, which depend on the legitimacy of its sustainability cred. Beyond the Port Arthur facility, which Roberts told me will begin production by the end of 2029 or early 2030, the company has a pipeline of additional facilities along the Gulf Coast in the works. It also has global ambitions. “When you have a fuel that is this negative, it really opens up a global market, because you can transport fuel out of Texas, whether that be into the EU, Africa, Asia, wherever it may be,” Roberts said, explaining that even substantial transportation-related emissions would be offset by the carbon-negativity of the fuel.
But alternative feedstocks such as forestry biomass are finite resources, too. That’s why many experts think that within the SAF sector, e-fuels such as Twelve’s that could one day source carbon via direct air capture and then electrolyze it have the greatest potential for growth. “It’s extremely dependent on getting sustainable CO2 and cheap electricity prices so that you can make cheap green hydrogen,” Shams told me. “But theoretically, it is unlimited in terms of what your total cap on production would be.”
In the meantime, airlines are focused on making their planes and engines more aerodynamic and efficient so that they don’t consume as much fuel in the first place. They’re also exploring other technical pathways to decarbonization — because after all, SAF will only be a portion of the solution, as many short and medium-length flights could likely be powered by batteries or hydrogen fuel. RMI forecasts that by 2050, 45% of global emissions reduction in the aviation sector will come from improvements in fuel efficiency, 37% will be due to SAF deployment, 7% will come from hydrogen, and 3.5% will come from electrification.
If you did the mental math, you’ll notice these numbers add up to 92.5% — not 100%. “What we have done is, let's look at what we are actually doing today and for the past three, four, five years, and let's see if we get to net zero or not. And the answer is, no. We don't get to net zero by 2050,” Shams told me. And while getting to 92.5% is nothing to scoff at, that means that the aviation sector would still be emitting about 700 million metric tons of CO2 equivalent by that time.
So what’s to be done? “The financing sector needs to step up its game and take a little bit more of a risk than they are used to,” Shams told me, noting that one of RMI’s partners, the Mission Possible Partnership, estimates that getting the aviation sector to net zero will require an investment of around $170 billion per year, a total of about $4.5 trillion by 2050. These numbers take a variety of factors into account beyond strictly SAF production, such as airport infrastructure for new fuels, building out direct air capture plants, etc.
But any way you cut it, it’s a boatload of money that certainly puts Pathway’s $2 billion SAF facility and Twelve’s $645 million funding round in perspective. And it’s far from certain that we can get there. “Increasingly, that goal of the 2050 net-zero target looks really difficult to achieve,” Shams put it simply. “Commitments are always going up, but more can be done.”
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Whichever way you cut it, this has been an absolute banner year for nuclear deals in the U.S. It doesn’t much matter the metric — the amount of venture funding flowing to nuclear startups, the number of announcements regarding planned reactor restarts and upgrades, gigawatts of new construction added to the pipeline — it’s basically all peaking. Stock prices are up across all major publicly traded nuclear companies this year, in some cases by over 100%.
“This year is by far the biggest year in terms of nuclear deals that has occurred, probably, since the 70s,” Adam Stein, the director of nuclear innovation at The Breakthrough Institute, told me. “It’s spanning the gamut from bringing a 40-year-old reactor back to things that have not even been proven scientifically yet.”
To name just a few announcements from this year: planning for a 4.4-gigawatt nuclear power complex is now underway in Texas; South Carolina’s state-owned utility is seeking buyers to restart construction on two partially built AP1000 reactors; New York governor Kathy Hochul is looking to build a new reactor in upstate New York; The Tennessee Valley Authority submitted a construction permit for a small modular reactor; Google signed a power purchase agreement with Commonwealth Fusion Systems; and another fusion company, Helion Energy, raised a whopping $425 million round of venture capital. On top of all that there’s the Palisades nuclear power plant in Michigan, which is targeted to restart by year’s end, bringing 800 megawatts of new nuclear power online.
Heading into the second Trump term, there were plenty of indications that the administration would support this technology with increasingly bipartisan appeal. So it wasn’t exactly a surprise that while the One Big Beautiful Bill eviscerated tax credits for solar and wind, it preserved them for both existing and new nuclear facilities. Now that this support is assured, Stein expects the nuclear announcements to keep rolling in. “We might have seen more deals earlier this year if there wasn’t uncertainty about what was going to happen with tax credits. But now that that’s resolved, I expect to hear more later this year,” he told me.
How much of this is, I asked him, is due to data centers and their seemingly insatiable demand for clean, firm power? “Most of it,” he said simply. By way of example, he pointed out how data center load growth has changed the outlooks for two small modular reactor companies in particular. “NuScale has been trying to find their first project for a long time now, after they had to cancel their [Utah Associated Municipal Power Systems] project. Kairos didn’t have a clear buyer for its first-of-a-kind, even though it was building two test reactors,” Stein explained. “Then all of a sudden, they all had additional deals in the works because of data center demand.”
Last year, Kairos inked a 500-megawatt deal with Google to meet the hyperscaler’s growing data center needs, while this year, Texas A&M selected the company — along with three others — to build a reactor at the university’s research and development campus. And while NuScale infamously canceled its first project in 2023 due to rising costs, this year it received approval from the Nuclear Regulatory Commission for a new and improved reactor design. Now the company’s CEO, John Hopkins, told Reuters that NuScale is in talks to deploy its tech with five unnamed “tier one hyperscalers.” Its stock is up more than 150% on the year.
That’s a big turnaround for a company that, less than two years ago, was widely considered a cautionary tale — and it’s not the only one in the industry with this type of comeback story. Right before NuScale’s project failed, another nuclear company, X-energy, announced that it would no longer go public due to “challenging market conditions” and “peer company trading performance.” But while X-energy still has yet to IPO, it appears to be doing just fine. In February, the company announced the close of a $700 million Series C follow-on round, coming on the heels of Amazon’s strategic investment last year.
“I think every company has their stories about how things are changing,” Seth Grae, CEO of the advanced nuclear fuel company Lightbridge, told me. Things have moved a lot faster, Grae said, since Trump released a series of executive orders aimed at accelerating nuclear energy deployment. “Just since May, we’ve received this highly enriched uranium [from the Department of Energy], made these fuel samples, got them qualified already at Idaho National Lab. We expect they’ll be in the reactor this year. Grae told me. “Things didn’t used to happen that fast in nuclear.”
Trump’s plans to fast track nuclear development have also raised serious concerns, however, as critics worry that acceleration could lead to laxer safety standards The executive orders call for, among other things, cutting staff at the Nuclear Regulatory Commission, just as the industry enters a period of intense activity. In June, the President fired one of the agency’s commissioners, Christopher Hanson, without cause. Another commissioner, Annie Caputo, resigned in July.
But right now, the nuclear industry is mostly basking in optimism. Grae credits the government’s strong support for the surge in nuclear stocks — Lightbridge’s own stock price has jumped 180% this year, while another nuclear fuel company, Centrus Energy, is up even more. The small modular reactor company Oklo is up 285% for the year, on the heels of last year’s 12-gigawatt non-binding deal with the data center company Switch — one of the largest corporate clean power agreements to date.
Last year’s slew of deals involving Oklo, X-energy, and Kairos show that the sector’s momentum had been building well before Trump took office. By 2023, the writing was already on the wall in terms of data center load growth, as grid planners began to predict a sharp rise in electricity demand after over a decade of stagnation. But when I asked Erik Funkhauser of the Good Energy Collective whether the prior two years compared with this one, he concurred with Stein. “Nope,” he told me. “We’re seeing capital infusion at a really, really high pace, as high of a pace as the company’s suppliers can keep up with on projects.”
Still, the party may not go on forever. “I see a potential for a Valley of Death,” Stein told me, similar to what many startups go through when they’re trying to raise later-stage funding rounds.
“If things don’t start to actually move forward with real progress, either getting licenses or building prototypes on time, then all of that investment will be pulled back.” That’s what the U.S. saw during the last so-called “nuclear renaissance” in the late 2000s, he explained, when a rash of large reactors were proposed with only two actually reaching completion.
These were the notorious Vogtle reactors 3 and 4 in Georgia, which finally came online in 2023 and 2024 respectively, running billions over budget and years behind schedule. In order for this latest round of nuclear enthusiasm to avoid the same fate, Stein told me it’s critical that leading projects demonstrate enough early success to maintain developer confidence in the economic and technical viability of new — and old — nuclear technologies.
That being said, the sector will inevitably contract. “Back when we saw this last scale-up, there were three designs that were really competing for attention, and now there are 75. So we’re going to see a lot of failures,” Stein said. The question for venture investors, he told me, is “how many failures of startups that you didn’t invest in are you willing to tolerate before you start to think the whole segment has trouble?”
The second main way this could all fall to pieces, he told me, is if “somebody tries to move too fast,” and that recklessness leads to “either a bankruptcy or an accident or something like that that will send ripples or shock waves through the whole sector.”
Indeed, a metaphorical or literal meltdown in the sector could put a quick halt to this year’s frenzied momentum. But within the next few years, as these announced projects begin to line up their licenses and come online — or fall apart— we’ll soon see whether this latest nuclear revival is a true turning point or just another bubble.
On the Senate’s climate whip, green cement deals, and a U.S. uranium revival.
Current conditions: Flash flooding strikes the Southeastern U.S. • Monsoon rains unleash landslides in southern China • A heat dome is bringing temperatures of up to 107 degrees Fahrenheit to France, Italy, and the Balkans.
An August 5 chart showing last month's record electricity demand peaks.EIA
The United States’ demand for electricity broke records twice last month. Air conditioners cranking on hot days, combined with surging demand from data centers, pushed the peak in the Lower 48 states to a high of 758,053 megawatts on July 28, between 6 p.m. and 7 p.m. EST, data from the U.S. Energy Information Administration’s Hourly Electric Grid Monitor shows. The following day, peak demand set another record, hitting 759,180 megawatts. That’s nearly 2% above the previous record set on July 15, 2024.
The EIA predicted demand to grow by more than 2% per year between 2025 and 2026. Forecasts are even higher in areas with large data centers and factories underway, such as Texas and northern Virginia. The milestone comes as the Trump administration cracks down on solar and wind energy, two of the fastest-growing and quicker-to-build sources of new generation. On Tuesday, The New York Times reported that the Environmental Protection Agency is moving to eliminate $7 billion in spending on grants for solar energy, though when Heatmap’s Emily Pontecorvo asked the agency, it said only that, “With the passage of the One Big Beautiful Bill, EPA is working to ensure Congressional intent is fully implemented in accordance with the law.”
Senator Brian Schatz, a Democrat from Hawaii, locked down enough votes on Tuesday to replace Illinois Senator Dick Durbin as the Democrats’ whip in the chamber. Durbin, who is retiring next year, has served in the Senate Democrats’ No. 2 position since 2005. In his endorsement on Tuesday, Senate Minority Leader Chuck Schumer of New York called Schatz “a close friend and one of my most valued allies.”
Schatz crusaded for the Inflation Reduction Act and told Heatmap he supported last year’s failed bipartisan permitting reform deal, even as progressive greens campaigned against its giveaways to fossil fuels. In a Shift Key podcast interview with my colleague Robinson Meyer and his co-host, Princeton professor Jesse Jenkins, in February, Schatz pitched a big tent for climate action. “We all have to hang together. It’s the American Clean Power Association. It’s the energy company that does both clean and fossil energy. It’s the transmission and distribution companies. It’s the manufacturers. It’s labor. It’s Wall Street. It’s K Street. Everyone has to hang together and say, not only is this good for business, but there’s something that is foundationally worse for business than any individual policy decision.”
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The Trump administration may be clawing back funding for cleaning up heavy industry, but Big Tech is still inking deals. On Monday, Amazon agreed to buy low-carbon cement from the startup Brimstone. Then on Tuesday, the data center developer STACK Infrastructure announced the completion of “a pilot pour” of green cement from rival startup Sublime. The moves highlight the growing demand for cleaner industrial materials amid increased scrutiny of the energy and pollution linked to server farms.
America’s uranium enrichment went out of business in the early 2000s after the Clinton-era megatons-to-megawatts program essentially ceded the industry to cheap Russian imports made from disassembled atomic weapons. Since banning imports from Russia last year, the U.S. has been ramping up funding for nuclear fuel again, especially as the industry looks to build new types of reactors that rely on fuel other than the low-enriched uranium that virtually all the country’s operating 94 commercial reactors use. On Monday, the Department of Energy announced its first pilot project for advanced nuclear fuels, giving the startup Standard Nuclear the first federal deal. On Tuesday, the agency signed a $1.5 billion deal to restore the so-called Atomic City on the 100-acre parcel of federal land at the former Paducah Gaseous Diffusion Plan in Kentucky.
The Trump administration gave permission to the National Weather Service to hire up to 450 meteorologists, hydrologists, and radar technicians after sweeping cuts from the Department of Government Efficiency, CNN’s Andrew Freedman reported. The agency, which was partly blamed for its warnings going unheeded ahead of the deadly Texas floods last month, also received an exemption from the federal hiring freeze.
The move came the same day as a federal judge blocked the administration from diverting billions of dollars in Federal Emergency Management Agency funding for disaster resilience and flood mitigation. The injunction warned FEMA against spending the money on anything else.
Beyond Meat is finally getting beyond meat. The company plans to shed the flesh reference in its name this week as it launches its new Beyond Ground product that promises more protein than ground beef. “With this launch,” Fast Company’s Clint Rainey reported, “Beyond Meat is becoming merely Beyond and turning its focus away from only mimicking animal proteins to letting plant-based proteins speak for themselves. The radical move is cultural, agricultural, and financial.”
Rob and Jesse talk through the proposed overturning of the EPA’s “endangerment finding” on greenhouse gases with Harvard Law School’s Jody Freeman.
The Trump administration has formally declared that carbon dioxide and other greenhouse gases are not dangerous pollutants. If the president gets his way, then the Environmental Protection Agency may soon surrender any ability to regulate heat-trapping pollution from cars and trucks, power plants, and factories — in ways that a future Democratic president potentially could not reverse.
On this week’s episode of Shift Key, we discuss whether Trump’s EPA gambit will work, the arguments that the administration is using, and what it could mean for the future of U.S. climate and energy policy. We’re joined by Jody Freeman, the Archibald Cox Professor of Law at Harvard and the director of Harvard’s environmental and energy law program. She was an architect of the Obama administration’s landmark deal with automakers to accept carbon dioxide regulations.
Shift Key is hosted by Jesse Jenkins, a professor of energy systems engineering at Princeton University, and Robinson Meyer, Heatmap’s executive editor.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, YouTube, or wherever you get your podcasts.
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Here is an excerpt from our conversation:
Robinson Meyer: I just want to make a related question, which is, you can actually say some of the sentences in the DOE report — you can believe tornadoes don’t show any influence from climate change and still believe heatwaves do, and still believe extreme rainfall events do. In fact, you could believe the cost of heat waves getting worse could justify the entire regulatory edifice.
Jody Freeman: What I love about you, Rob, right now, is you’re kind of incensed about little points that might individually sort of be right, maybe each one separately, but none of it adds up to even a chink in the armor. Right? And what’ll have to happen is the scientific community writ large, en masse, is going to have to come back and say, even if one or two or three of these sentences could possibly, plausibly be actually accurate, it does nothing to change the overwhelming —
Jesse Jenkins: It doesn’t matter.
Freeman: Right. What I think is happening is we’re all getting poked and distracted and tweaked into outrage over science, when in fact, the first argument they’re making is the one where they could actually attract some judges and justices to say, Oh wait, maybe you have a little more discretion here to set a threshold level. You know, Maybe it matters that you’re saying nothing we do here in the U.S. will make a difference in the end to global warming, and maybe that is a reason you don’t want to regulate. Hmm, maybe we’ll accept that reason. And that’s what we need, I think, to be more concerned about.
Jenkins: You’re saying, don’t get distracted by the fight over the climate science. That fight is very clear. It’s this legal argument that this isn’t an air pollutant because it’s not a local air pollutant, it mixes globally with all the other CO2, and we can’t, you know, each class of cars is a tiny contributor to that, and so we shouldn’t worry about it —
Freeman: And much of this is a replay, or a rehash of arguments that the George W. Bush administration lost in Massachusetts vs. EPA. So a lot of this is like, let’s take another run at the Supreme Court.
Mentioned:
The EPA Says Carbon Pollution Isn’t Dangerous. What Comes Next?
The EPA on its reconsideration of the endangerment finding
Jody’s story on the change: Trump’s EPA proposes to end the U.S. fight against climate change
Jesse’s upshift (and accompanying video); Rob’s sort of upshift.
This episode of Shift Key is sponsored by …
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Music for Shift Key is by Adam Kromelow.