Global climate tech funding has been falling for three years, but the UK posted a 24% increase. What's protecting British green tech startups, and which sectors are still pulling in serious money.
The global climate tech investment story of the last three years should have pulled the UK down with it, but it didn't and that divergence, between a world retreating from green startups and UK doubling down on them, is the most important story in the UK startup ecosystem that almost nobody is paying attention to.
Global climate tech VC fell nearly 30% in 2024, according to PwC's Global State of Climate Tech report.
This is the third consecutive annual decline, as the capital that had poured into the sector since the post-pandemic boom has been pulling back, it has now redirected toward AI, spooked by rising interest rates, and sobered by the gap between climate tech's early promise and the slow, expensive reality of commercialising it.
So, the UK's response was to grow 24%.
Climate tech investment reached £4.5 billion in 2024, up from £3.6 billion the year before. British investors weren't just holding their nerve, they were accelerating.
The question worth asking is why.
The answer, it turns out, matters enormously for every founder building in this space right now.
Why the global retreat happened
Understanding the UK's position requires understanding what broke elsewhere first.
Climate tech peaked globally at over $40 billion in annual VC investment in 2021, by 2024, that had fallen to $37.8 billion - a 37.6% drop from the peak.
The sectors hit hardest tell their own story: battery investments fell 79%, steel and industrial decarbonisation fell 80%, mining and metals fell 74%.
Capital retreated fastest from the areas with the longest commercialisation timelines and the most complex regulatory environments.
This is the Valley of Death problem, dressed up in sector-specific numbers, climate tech is physically intensive in a way software is not.
The gap between a working prototype and a commercially deployable product requires a kind of patient capital that generalist VCs are structurally poorly suited to provide. When AI started offering faster cycles, lower capital requirements, and clearer near-term revenue - the same venture dollars began flowing there instead.
Climate tech became less convenient, and the market responded accordingly.
Four reasons the UK held and grew
The UK's divergence from the global trend is not accidental, these four structural factors explain it.
Policy stability is the foundation. The UK has a legally binding net zero target written into law - not a manifesto pledge, not a voluntary commitment. That legislative durability gives investors a framework they can actually model against. When the policy floor feels solid, long-horizon investments in clean energy solutions become considerably more bankable. UK investors channelled £2.4 billion into domestic climate tech firms in 2024, a 7% rise in investment volume from the year before.
The AI intersection is the growth engine. UK-based AI climate tech companies saw investment increase 128% in 2024 — from £440 million to £1.01 billion. British firms now account for 22% of all global investment in AI-related climate tech startups. That concentration of capability in a single national ecosystem is actually not coincidence. It reflects a genuinely strong cohort of technically sophisticated founders who have found the overlap between machine learning and environmental impact.
"While the recent growth in UK climate tech investment is encouraging, we must continue to identify and invest in innovative solutions, push for increased government support and focus investor attention across a broader range of sectors — especially where decarbonisation is more challenging." — James Pincus, Corporate Finance Partner, PwC UK
Energy infrastructure demand is the third driver. The AI boom has created an unprecedented appetite for clean energy at scale, because data centres need electricity. They need it continuously, at high density, and increasingly without the carbon liability that coal and gas carry for ESG-conscious investors. That demand has pulled 35% of all UK climate tech funding into clean energy solutions in 2024, up from 30% the previous year.
Investor maturity is the fourth factor. The UK green tech ecosystem has been building long enough that a cohort of specialist investors, with genuine domain expertise and patient capital structures has emerged. That expertise matters in a sector where generalist VCs consistently underestimate the timeline to return.
Where the money is actually going
Energy remains the dominant category - grid infrastructure, clean firm power, utility-scale storage, and nuclear, particularly fusion and small modular reactors. Climate adaptation and resilience technologies are the fastest-growing sub-category, with 28% of all UK climate tech deals in 2024 focused on flood management, extreme weather prediction, and supply chain resilience. As the physical consequences of climate change become more economically costly, the commercial case for adaptation solutions has strengthened considerably.
The sectors lagging are equally instructive. Industrials - 34% of global greenhouse gas emissions - received just 7% of climate tech investment in 2024, down from 17% the year before.
Food, agriculture, and land use remain chronically underfunded relative to their emissions contribution. These are the areas where the gap between capital and need is widest and where the next generation of opportunities is most likely to emerge for founders willing to go where the money hasn't followed yet.
What does it mean if you're building here
The UK is, by the available evidence, the best place in Europe to be building a climate tech startup right now.
Policy is stable, the investor base is growing and maturing, the AI intersection is creating genuine competitive advantage for technically strong teams, and the government is actively directing non-dilutive capital toward the sector through Innovate UK funding, Great British Energy, and net zero funding programmes.
That does not mean it is easy.
The Valley of Death is very much real.
The Series A gap that affects all UK startups is felt acutely in climate tech, where timelines are long and capital requirements are high.
But the structural tailwind is real in a way it has not been for several years, the founders who understand which sectors capital is actually moving into and position their companies accordingly, are operating with an advantage that most of their global counterparts currently do not have.
We believe that this advantage is worth understanding clearly and worth using.
Read next: Most UK climate tech founders aren't claiming the government grants they're entitled to - Most Climate Tech Startups Don't Know This Funding Exists
Sources: PwC Global State of Climate Tech 2024 · PitchBook · Vestbee Climate Market Analysis 2025 · Environment Journal · Edie.net · SVB Future of Climate Tech April 2026
