Add CO2 offset (#2848)

README.md

@@ -648,6 +648,7 @@ API | Description | Auth | HTTPS | CORS |
 | [BreezoMeter Pollen](https://docs.breezometer.com/api-documentation/pollen-api/v2/) | Daily Forecast pollen conditions data for a specific location | `apiKey` | Yes | Unknown |
 | [Carbon Interface](https://docs.carboninterface.com/) | API to calculate carbon (C02) emissions estimates for common C02 emitting activities | `apiKey` | Yes | Yes |
 | [Cloverly](https://www.cloverly.com/carbon-offset-documentation) | API calculates the impact of common carbon-intensive activities in real time | `apiKey` | Yes | Unknown |
+| [CO2 Offset](https://co2offset.io/api.html) | API calculates and validates the carbon footprint | No | Yes | Unknown |
 | [Danish data service Energi](https://www.energidataservice.dk/) | Open energy data from Energinet to society | No | Yes | Unknown |
 | [GrünstromIndex](https://www.corrently.de/hintergrund/gruenstromindex/index.html) | Green Power Index for Germany (Grünstromindex/GSI) | No | No | Yes |
 | [La Data Verte](https://ladataverte.fr) | Aggregation of multiple environmental indicators (CO2 emissions, Average temperature, etc) | No | Yes | Unknown |