Climate & Carbon APIs
Climate & Carbon APIs mix long-term climate records with tools for measuring emissions. NASA POWER provides satellite-derived solar and temperature data free and without a key, the Copernicus Climate Data Store offers ERA5 reanalysis and climate projections, and Google Earth Engine analyzes petabytes of satellite imagery through OAuth. On the carbon side, Carbon Interface estimates CO2 from electricity, flights, vehicles and shipping. Free Weather APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
1ClickImpactPay-per-action API to plant trees, capture carbon, or clean oceans, with GPS-verified impact tracking. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
Carbon InterfaceEstimates CO2 emissions from electricity, flights, vehicles, shipping and fuel via REST. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
Copernicus Climate Data StoreERA5 reanalysis back to 1940, seasonal forecasts and climate projections as gridded files via queued jobs. Weather & Environment › Climate & Carbon | Free | API key | JSON | Unlimited | Live |
Google Earth EngineCloud platform for analyzing petabytes of satellite imagery and other geospatial/environmental datasets. Weather & Environment › Climate & Carbon | Freemium | OAuth | JSON | — | Live |
MeteostatHistorical hourly, daily and monthly weather records and climate normals for stations or any lat/lon point. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
NASA POWERProvides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
NOAA Climate Data OnlineHistorical station observations and daily-to-yearly climate summaries from NOAA's archive, by station or area. Weather & Environment › Climate & Carbon | Free | API key | JSON | 10k+/day | Live |
SustainMetrics18,000+ GHG emission factors from DEFRA, EPA, ADEME and Ember for Scope 1-3 carbon footprint calculations. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
USGS Water ServicesReal-time and historical streamflow, gage height, and water-quality readings from US stations. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
WeatherTotalsUS snow, rain and hail totals plus current aurora visibility, sourced from NOAA and NWS observations. Weather & Environment › Climate & Carbon | Free | None | JSON | 10k+/day | Live |
Website Carbon APIEstimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
1ClickImpactFreemiumLive
Pay-per-action API to plant trees, capture carbon, or clean oceans, with GPS-verified impact tracking.
API key · JSON
<100/day
llms.txt
Carbon InterfaceFreemiumLive
Estimates CO2 emissions from electricity, flights, vehicles, shipping and fuel via REST.
API key · JSON
<100/day
no machine-readable spec
Copernicus Climate Data StoreFreeLive
ERA5 reanalysis back to 1940, seasonal forecasts and climate projections as gridded files via queued jobs.
API key · JSON
Unlimited
OpenAPI spec
Google Earth EngineFreemiumLive
Cloud platform for analyzing petabytes of satellite imagery and other geospatial/environmental datasets.
OAuth · JSON
—
no machine-readable spec
MeteostatFreemiumLive
Historical hourly, daily and monthly weather records and climate normals for stations or any lat/lon point.
API key · JSON
<100/day
no machine-readable spec
NASA POWERFreeLive
Provides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date.
None · JSON
Unlimited
OpenAPI spec · llms.txt
NOAA Climate Data OnlineFreeLive
Historical station observations and daily-to-yearly climate summaries from NOAA's archive, by station or area.
API key · JSON
10k+/day
no machine-readable spec
SustainMetricsFreemiumLive
18,000+ GHG emission factors from DEFRA, EPA, ADEME and Ember for Scope 1-3 carbon footprint calculations.
API key · JSON
<100/day
no machine-readable spec
USGS Water ServicesFreeLive
Real-time and historical streamflow, gage height, and water-quality readings from US stations.
None · JSON
Unlimited
no machine-readable spec
WeatherTotalsFreeLive
US snow, rain and hail totals plus current aurora visibility, sourced from NOAA and NWS observations.
None · JSON
10k+/day
no machine-readable spec
Website Carbon APIFreeLive
Estimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type.
None · JSON
Unlimited
no machine-readable spec
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Choosing a Climate & Carbon API
Is there a free Climate & Carbon API?
Yes. NASA POWER, Copernicus Climate Data Store, NOAA Climate Data Online, USGS Water Services, WeatherTotals and 1 other are free to use, and Carbon Interface, 1ClickImpact, Google Earth Engine, Meteostat and SustainMetrics have a free tier alongside paid plans. See all free Weather APIs.
Which Climate & Carbon APIs work without an API key?
NASA POWER, USGS Water Services, WeatherTotals and Website Carbon API need no key or sign-up, so you can try them with a plain request.
Can I call a Climate & Carbon API from front-end JavaScript?
NASA POWER, USGS Water Services and WeatherTotals allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use Climate & Carbon APIs in a commercial project?
Copernicus Climate Data Store, 1ClickImpact, Meteostat, USGS Water Services and WeatherTotals permit commercial use. Google Earth Engine restricts it, for example to non-commercial or attributed use, so read the terms first.
Which Climate & Carbon APIs work with AI agents?
NASA POWER and Copernicus Climate Data Store publish an OpenAPI spec for generating clients and tools.
More specific: Carbon Emissions APIs
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