Q4 2025 Rankings
Climate Tech Startups to Watch, Q4 2025
Climate tech engineering activity is concentrated in grid software and carbon accounting tooling.
Key takeaways, at a glance
In Q4 2025, 3 of 5 tracked climate tech startups show positive engineering acceleration. CliMA leads with 44 commits over 14 days (+100% change). The dominant signal pattern is "Framework migration". Average sector commit velocity is 50 commits per 14-day window. These engineering momentum signals have historically preceded fundraise announcements by three to six weeks.
Data sourced from public GitHub activity. Read our methodology
| # | Company | Stage | Geo | Commits (14d) | Change | Contributors | Contrib. Growth | New Repos | Signal |
|---|---|---|---|---|---|---|---|---|---|
| 1 | CliMA The next generation of climate models. Built in the open. View signal profile → | Growth | US | 44 | +100% | 81 | +0% | 0 | Framework migration |
| 2 | ESCOMP Earth system modeling infrastructure providing climate simulation tools for the scientific research community. View signal profile → | Growth | Unknown | 98 | +48% | 61 | +0% | 0 | Framework migration |
| 3 | opennem Formerly OpenNEM, Open Electricity aims to make the wealth of public energy data more accessible View signal profile → | Seed | APAC | 22 | +16% | 9 | +121% | 0 | Engineering hiring burst |
| 4 | carbon-design-system An open-source design system built by IBM. View signal profile → | Growth | US | 82 | -11% | 374 | +9% | 1 | Deceleration |
| 5 | nco nco is aclimate tech series a/b startup, modernizing their technology stack for scale. View signal profile → | Series A/B | Unknown | 6 | -33% | 25 | +0% | 0 | Deceleration |
Sorted by commit velocity change (14-day window, descending). Top 3 highlighted. Data last updated Q4 2025.
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Projected lead-time window
≈31-day lead window
Projected next milestone
Platform or stack transition
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More views of Climate Tech, Q4 2025
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Q4 2025 vs Q3 2025
How Climate Techcommit velocity has shifted quarter-over-quarter →
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Frequently Asked Questions
What engineering signals are climate tech startups showing in Q4 2025?
In Q4 2025, we are tracking 5 climate tech startups with measurable GitHub engineering signals. 3 of 5 show positive commit velocity growth. The most common signal type is "Framework migration", observed in 4 of the tracked companies. The average 14-day commit velocity across the sector is 50 commits, with CliMA leading at 44 commits (+100% change). These patterns have historically preceded fundraise announcements by three to six weeks.
Which climate tech startup has the highest engineering acceleration in Q4 2025?
CliMA leads the climate tech sector in Q4 2025 with 44 commits over a 14-day window, representing a +100% change from the prior period. With 81 active contributors, CliMA is showing a "Framework migration" pattern, one of the more reliable leading indicators of a significant product milestone or fundraise.
Where are the most active climate tech engineering teams located?
Among the 5 climate tech startups we track, US accounts for the highest concentration with 2 teams. Startups developing clean energy, carbon monitoring, and climate adaptation technologies. Geographic distribution matters for investors because engineering talent clusters correlate with sector-specific domain expertise and proximity to early adopter customers.