You asked about ClimateTech
32 people built something like it. 5 are gone.
That is 17% of the ones whose fate we could settle, against 23% across the whole register. 3 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2017-01-01 | YCSolugen Decarbonizing the chemicals industry. · solugen.com | still up |
| 2016-06-01 | YCValidere A carbon MRV solution for energy and hard-to-abate sectors · validere.com | still up |
| 2018-06-01 | YCCuldesac We build cities for people, not cars. · culdesac.com | still up |
| 2021-06-01 | Home electrification at $0 upfront cost · solarmente.es | gone |
| 2023-01-01 | YCRUUF Managed marketplace for solar in Latam · ruuf.cl | still up |
| 2017-06-01 | Cheese and dairy products from plant-derived dairy proteins · nobellfoods.com | still up |
| 2021-01-01 | Juicy marbles makes thick juicy and marbled plant based steaks. · juicymarbles.com | still up |
| 2021-01-01 | YCRemora Carbon capture for vehicles · remoracarbon.com | still up |
| 2020-01-01 | Makes guilt-free plastics from food waste · genecis.co | still up |
| 2022-01-01 | Unlocking carbon markets for European forest owners · pina.earth | acquired |
| 2018-01-01 | YCOvipost Automated insect farming · ovipost.com | gone |
| 2022-01-01 | Software to find the best sites for renewables on the electrical grid · niraenergy.com | still up |
| 2021-06-01 | Water risk mitigation for industrial sites · waterplan.com | still up |
| 2022-01-01 | Underwater robotic vehicles that collect battery metals responsibly · impossiblemetals.com | still up |
| 2015-06-01 | YCNebia Nebia is a breakthrough shower system, based on a premium experience,… · nebia.com | acquired |
| 2023-01-01 | YCBluedot Bluedot is a single payment platform for EV drivers and fleets. · thebluedot.co | still up |
| 2025-06-01 | YCDuranium Reshoring critical metal production · duranium.co | still up |
| 2022-06-01 | We recycle plastic using engineered enzymes · birchbiosciences.com | still up |
| 2019-06-01 | SaaS that helps renewables & energy storage operate more profitably · gaia-scope.com | acquired |
| 2021-06-01 | Building the next generation food ingredient champion. · planet-a-foods.com | still up |
| 2026-06-01 | We turn waste gases into supply-secure chemicals · rise-reforming.com | still up |
| 2024-06-01 | We build and operate underwater data centers. · networkocean.io | still up |
| 2023-06-01 | Incentives and financing for energy efficiency upgrades · line.build | gone |
| 2024-06-01 | YCRewbi A stealth mode startup. · rewbi.com | still up |
| 2025-01-01 | Automating refurbishment of $1T in consumer electronics · reviserobotics.com | still up |
| 2023-01-01 | Revolutionary, Modern Wing Sails · outsailtech.com | gone |
| 2019-01-01 | YCValo Cutting edge hydrofoil systems for boatbuilders · boundarylayer.tech | still up |
| 2026-06-01 | YCMeteoric Drones that clear clouds over solar farms and weaken hurricanes · meteoric.earth | still up |
| 2022-06-01 | We enable landlords to generate income from solar panels. · wandsolar.com | still up |
| 2022-01-01 | First commodity marketplace for hydrogen. · phoenixhydrogen.com | gone |
| 2023-01-01 | YCAtmeto We develop ML that optimizes how batteries in the grid store energy · atmeto.com | still up |
| 2025-01-01 | YCAstro The world’s first AI energy developer · astroenergy.ai | still up |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.