Travel Emissions
Carbon API

// Calculate emissions for an expense receipt
async function enrichExpenseWithCarbon(expense) {
  if (expense.category !== 'travel') return expense;

  const response = await fetch(
    `https://api.emissions.dev/v1/travel/emissions?` +
    `origin_country=${expense.departure_country}` +
    `&origin_location=${expense.departure_city}` +
    `&destination_country=${expense.arrival_country}` +
    `&destination_location=${expense.arrival_city}` +
    `&transport_mode=${expense.travel_mode}&passengers=1`,
    { headers: { Authorization: `Bearer ${API_KEY}` }}
  );

  const data = await response.json();
  
  return {
    ...expense,
    co2e_kg: data.data.attributes.emissions.co2e,
    // Now visible in expense exports & reports
  };
}

# Calculate total event travel emissions
import requests

def calculate_event_footprint(attendees, venue):
    total_co2e = 0
    
    for attendee in attendees:
        response = requests.get(
            "https://api.emissions.dev/v1/travel/emissions",
            headers={"Authorization": f"Bearer {API_KEY}"},
            params={
                "origin_country": attendee['country'],
                "origin_location": attendee['city'],
                "destination_country": venue['country'],
                "destination_location": venue['city'],
                "transport_mode": "air",
                "return_trip": True,
            }
        )
        co2e = response.json()['data']['attributes']['emissions']['co2e']
        total_co2e += co2e
    
    return total_co2e

# TechCrunch Disrupt: 847 tonnes CO₂e from 3,200 attendees