curl --request GET \
  --url https://api.voltview.co.uk/v1/sites/{siteId}/emissions \
  --header 'Authorization: Bearer <token>'

{
  "siteId": "<string>",
  "period": "<string>",
  "emissions": 123,
  "emissionsIntensity": 123,
  "emissionsBySource": {
    "electricity": 123,
    "gas": 123,
    "other": 123
  },
  "historicalData": [
    {
      "period": "<string>",
      "emissions": 123
    }
  ],
  "carbonSavings": 123,
  "targetReduction": 123
}