curl --request GET \
  --url https://api.example.com/projects/{project_id}/ghg/carbon_additionality \
  --header 'x-api-key: <api-key>'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}