---
title: "Contribution of one country to observed global warming"
method: GET
path: "/api/v1/environment/co2/temperature-contribution/{iso3}"
tags: ["Environment"]
---

# Contribution of one country to observed global warming

`GET /api/v1/environment/co2/temperature-contribution/{iso3}`

Returns the per-country contribution to observed global warming, decomposed by gas (CO2, methane, nitrous oxide, total greenhouse gases) and expressed in degrees Celsius. Includes the share-of-total percent. These values are CONTRIBUTIONS to warming, not absolute temperatures. Methodology from Jones et al. National contributions to climate change (2025); redistributed by Our World in Data. Published under CC BY 4.0 with dual attribution.

## Path parameters

- `iso3` string, required — ISO 3166-1 alpha-3 country code. Case-insensitive; normalised to uppercase.

## Query parameters

- `start_year` integer, nullable — Inclusive start year (integer). Temperature-contribution series begin around 1851.
- `end_year` integer, nullable — Inclusive end year. Defaults to the latest year in the bundle.

## Response `200`

Annual per-country per-gas contributions to observed global warming.

- EnvelopeCo2TemperaturePayload
  - `data` Co2TemperaturePayload, required — Per-country contribution to observed global warming.
    - `iso_code` string, required — ISO 3166-1 alpha-3 code echoed from the path parameter, uppercased.
    - `country` string, nullable — Country name as published by OWID.
    - `unit` string — Unit applied to the per-gas numeric fields. `share_of_total` is in percent.
    - `observations` Co2TemperatureRow[], required — Yearly temperature-contribution rows ordered ascending by year.
      - `year` integer, required — Observation year.
      - `co2` number, nullable — Contribution of this country's historical CO2 emissions to observed global warming, in degrees Celsius.
      - `methane` number, nullable — Contribution of this country's historical methane emissions to observed global warming, in degrees Celsius.
      - `nitrous_oxide` number, nullable — Contribution of this country's historical nitrous-oxide emissions to observed global warming, in degrees Celsius.
      - `total_ghg` number, nullable — Total contribution of this country's greenhouse-gas emissions to observed global warming, in degrees Celsius.
      - `share_of_total` number, nullable — Share of global warming attributable to this country, in percent.
    - `count` integer, required — Number of observations in the response.
    - `attribution` string, required — CC BY 4.0 attribution string naming OWID and Jones et al. (2025).
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

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