What Is Climate Tech — And What’s Actually Working Right Now?

Andres takes the first half of the episode, and he comes in with good news. Which, as Victoria points out, feels almost suspicious given the year we’ve had.

Climate tech, in the simplest terms, is technology designed to reduce, neutralise, or capture the emissions and environmental damage caused by human activity. It’s the tools we’re building to get to net zero — or at least to net neutral, which Victoria helpfully distinguishes as the more realistic near-term target. Net neutral means emissions are balanced out. Net zero means you’re not emitting them in the first place.

The good news is that several of these tools are finally crossing from promising to profitable — which, in a world where business cases drive adoption, matters enormously.

Carbon Capture Is Becoming a Real Industry

Carbon capture technology — pulling CO2 directly from the atmosphere — has been theoretically viable for years. The bottleneck has always been cost and scale. That’s changing. AI is now being used to research new solvents that can capture CO2 with 20% less energy, making the process increasingly efficient. The captured carbon can be turned into usable products — including sustainable aviation fuel, which matters enormously for decarbonising shipping and freight, two of the hardest-to-abate sectors in global Scope 3 emissions. Carbon-infused concrete and low-carbon building materials (think: Planted, from Episode 7) are also part of this picture.

But Andres is careful to flag a critical distinction: just because a solution exists doesn’t mean it’s being implemented. The Colossus data center in Memphis — used to train Elon Musk’s Grok AI — has access to closed-loop water recycling technology that would prevent the evaporation of water drawn directly from Memphis’s main supply. It isn’t using it. The same facility used a legal loophole to install methane generators while avoiding emissions regulations — and was releasing both water and methane uncontrolled until very recently.

“Just because the technology exists doesn’t mean they’re actually implementing it in real life. We need a mandate.”

Solutions and deployment are two separate problems. Climate tech is winning on the first. The second is still a fight.

Hydrogen: Finally Getting Exciting

Hydrogen has been the perpetual “almost there” of clean energy. Energy-intensive to produce, with the cleanest generation methods historically relying on natural gas — which defeats much of the point. That’s shifting, fast.

The Spanish National Research Council recently announced a breakthrough in membrane technology for hydrogen production via electrolysis — the process of splitting water (H2O) into hydrogen and oxygen. The new membranes are 800% more permeable and 30% more selective than previous industry standards. In plain terms: hydrogen passes through faster, comes out purer, and the whole process takes dramatically less energy.

Purity matters because impure hydrogen loses energy density and disrupts downstream chemical processes. And permeability means throughput — more hydrogen produced per unit of energy input.

The practical upshot? What used to take three days to process can now be done in three hours. Hydrogen can potentially be generated on-site at fuelling stations — connected to solar panels, grey water, or even atmospheric moisture — turning a hydrogen pump into a small-scale, self-sustaining production facility. At 4% humidity with a couple of solar panels, meaningful amounts of hydrogen can be extracted.

On the vehicles side: hydrogen cars refuel in about three minutes (like petrol, not like EVs). The byproduct of using hydrogen as fuel is water vapour. They don’t use lithium-ion batteries. And despite public anxiety about flammability, research — including from Toyota — shows hydrogen dissipates so rapidly in the event of a breach that it poses less fire risk than petrol.

Fourth-Generation Nuclear: The Quiet Game-Changer

This is the one Andres is most excited about — and with good reason.

Fourth-generation nuclear reactors are passively safe, meaning they can, by the laws of physics, cool themselves down without human intervention in the event of a problem. No Chernobyl scenarios. No meltdowns requiring emergency response. You can, as Andres puts it, essentially walk away.

They run on nuclear waste — the radioactive material people associate with glowing green barrels — burning it as fuel rather than stockpiling it. And they operate at temperatures of 700–950°C, which makes them extraordinarily useful for hydrogen production: at those temperatures, electrolysis efficiency reaches 50%+, compared to standard rates. The heat used to cool the reactor becomes the energy source for splitting steam into hydrogen and oxygen — a closed-loop system where the data center, the reactor, and the hydrogen pump could theoretically all sit in the same facility.

The legislative bottleneck that paralysed the US nuclear industry since the 1970s — a cycle of stop-start regulations that stagnated development — is now being fast-tracked, partly because tech companies need power for data centers and nuclear is the only scalable option that doesn’t require waiting for grid upgrades. The irony isn’t lost on either host: the same industry that lobbied against nuclear for decades is now lobbying to fast-track it because it needs the energy.

“At least the technology is getting fast-tracked — and apparently the legislation now applies to communities too, not just data centers.”

Climate Finance: Who’s Paying, and Where Is the Money Going?

Victoria takes the second half of the episode, and she zeroes in on the question that underpins everything: who funds climate solutions, and how does that money actually flow?

Climate finance comes from three broad sources: government, private sector, and international institutions. Each has different incentives, different timelines, and different problems.

Government funding is taxpayer money, which means it requires political justification — and in democracies, that means election cycles and short-term thinking. Infrastructure projects with 12-year return horizons are hard sells to lawmakers on four-year terms.

Private sector funding is where Victoria sees cautious optimism. ESG (Environmental, Social, and Governance) ratings have become a genuine commercial signal — companies like Patagonia built their brand on sustainability, and now even fast fashion brands like H&M and Zara are launching sustainably sourced lines, not because of regulation, but because customers are demanding it. The market, imperfectly and unevenly, is responding. The limitation is monopolistic industries that don’t need to compete on these grounds — and for those, government remains the only lever.

International finance — development funds, the UN Adaptation Fund, loss and damage mechanisms negotiated at COP — is where things get most complicated and most unjust.

The Adaptation Fund: Great Theory, Broken Implementation

The Adaptation Fund was designed as a tiered system: countries most at risk from climate change, with the least capacity to respond, receive priority support. Small island states in the Pacific. Indonesia, where land is literally sinking. The Guna Yala island communities off Panama, which have already begun relocating populations to the mainland.

The money is there — in theory. In practice, bureaucracy has stalled implementation. The funds sit. The islands sink.

More damaging still is the structure of much international climate finance: it arrives as loans, not grants. Countries that did not cause the climate crisis are expected to go into debt to survive it — and pay interest on that debt to the wealthy nations whose historical emissions created the problem in the first place. Victoria doesn’t mince words on this.

“You’re asking a country that is trying to rebuild and survive to pay you back with interest. A lot of countries go into debt trying to deal with a crisis they didn’t cause.”

This is the structural argument behind climate reparations — not as charity, but as accountability for historical emissions and the wealth extracted through colonisation.

Carbon Markets: The Idea That Could Actually Work

Carbon markets — where companies purchase carbon credits that fund emissions-reduction projects in other countries — get a more hopeful treatment here than they often do in climate discourse. In theory, a UK company offsets its emissions by funding a solar project in Ghana. The UK gets its carbon neutrality. Ghana gets clean energy infrastructure it couldn’t otherwise afford. That’s climate justice and climate finance working simultaneously.

The problems are real: greenwashing, poor verification, credits that don’t represent real reductions, and a system that lets rich countries outsource the problem. But the underlying mechanism — wealthy emitters paying developing countries to build clean infrastructure — is structurally sound if properly governed. As Victoria puts it: “Put your money where your harm is.”

Key Takeaways:

⚡ The tech is there. Deployment is the problem. Carbon capture, hydrogen membranes, fourth-gen nuclear — the breakthroughs are real. The gap is between what’s possible and what’s being mandated.

💧 Hydrogen is crossing the viability threshold. 800% more permeable membranes, 3-hour processing vs. 3 days, on-site generation at fuelling stations — the infrastructure case for hydrogen is getting very strong, very fast.

☢️ Fourth-gen nuclear is quietly changing everything. Passively safe, waste-burning, and capable of generating hydrogen as a cooling byproduct — and the legislative logjam is finally breaking.

💰 Climate finance is three systems with three different failure modes — political short-termism in government, greenwashing risk in the private sector, and structural injustice in international lending.

🌊 The Adaptation Fund exists. It’s just not working. The money, the tier system, and the framework are all in place. Implementation and loan-versus-grant structures are the blockers.

🌍 Carbon markets could be climate justice — if they’re done right. Wealthy emitters funding clean infrastructure in vulnerable nations is the right idea. The execution needs serious governance reform.

Final Thoughts

What makes this episode work isn’t the technical depth — though there’s plenty of that. It’s the honesty. Victoria and Andres have spent a season interviewing experts at the frontier of climate tech, fossil fuel accountability, and community-centred solutions. In Episode 11, they sit with what they’ve learned and ask the same question a lot of listeners are probably asking: okay, but what does all of this actually mean?

Their answer is layered. The technologies are genuinely exciting. The business cases are starting to appear. The market is, in patches, responding. And the international finance systems designed to protect the world’s most vulnerable communities are paralysed by bureaucracy and structured injustice.

The season’s through-line, from Josh Dorfman’s grass-panel building materials to Holly Alpine’s enabled emissions campaign to Patrick Galey’s fossil fuel investigations, is that the tools to solve the climate crisis are largely not the problem. The problem is the systems — political, financial, corporate — that determine whether those tools get deployed, for whom, at what speed, and at whose cost.

“We have the solutions. We just need to implement them. We can stop researching for a bit.”

Maybe that’s the most clarifying thing said all season.