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Every product, material, dataset, switch, and database search result can return its full set of EN 15804+A2 environmental impact indicators — not just carbon. Impacts come back under a top-level impacts field, keyed by the indicator’s canonical code (for example GWP-fossil, ODP, AP). You choose which indicators to include with the impacts query parameter.
For the full list of indicators and what each one measures, see Environmental impact indicators.

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The impacts field

impacts is an object keyed by indicator code. Each value carries the indicator’s unit and method, plus its values for the individual life-cycle stages (A1, A2, A3, …) and the aggregated totals (totalCarbonFootprint, A1_A3, …) the indicator covers. 
{
  "uuid": "123e4567-e89b-12d3-a456-426614174000",
  "name": "Steel billet, hot rolled",
  "impacts": {
    "GWP-fossil": {
      "unit": "kgCO2e",
      "method": "Mixed",
      "totalCarbonFootprint": "10",
      "A1_A3": "10"
    },
    "ODP": {
      "unit": "kgCFC11e",
      "method": "EN15804+A2 - Core impact categories and indicators",
      "A1_A3": "0.0000012"
    },
    "AP": {
      "unit": "molH+e",
      "method": "EN15804+A2 - Core impact categories and indicators",
      "A1_A3": "2"
    }
  }
}
Values are strings. One that is genuinely zero is "0"; one with no value is absent. The aggregated stage A1_A3 is returned alongside the individual A1, A2, and A3 stages, so you can read either the combined product stage or its parts. method is Mixed when the total aggregates two or more components from different methods — common for the headline GWP-fossil total.

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The impacts query parameter

Add ?impacts= to any GET that returns these resources to control which indicators come back.
?impacts= valueReturns
absent or emptyOnly GWP-fossil
allEvery indicator
gwp-fossil,odp,apJust those indicators (codes are case-insensitive)
An unrecognized code returns 400 with the list of valid codes. all is only honored on its own — ?impacts=all,gwp-fossil is treated as a request for an unknown code and returns 400. 
curl https://app.variable.global/v1/dataset/{uuid}?impacts=all \
  -H "Authorization: Bearer $TOKEN"
GWP-fossil is always available. Access to the full indicator set may depend on your account.

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Deprecation: footprint.CO2e

The existing footprint.CO2e object is unchanged and keeps working, but it is deprecated in favor of impacts["GWP-fossil"], which carries the same GWP-fossil values. Migrate to impacts when you can; footprint.CO2e has no removal date yet.
Endpoints: Product, Material, Dataset, Switch, and Database search.