Our travel emissions April 2025-March 2025

For the year April 2024 to March 2025, we improved our travel emissions accounting to better capture the impact of our travel.

How we calculate our travel emissions

We calculated the greenhouse gas (GHG) emissions associated with our international travel, which total 4,932 kg CO2e, almost 26 times larger than the last financial year. Most of our international travel (43 of 59 journeys) was by train, with OG team members travelling by rail as far as Lisbon and Geneva. Emissions from only our international rail travel remained almost the same as last year (150 kg CO2e in 2024/25, compared with 160 kg CO2e in 2023/24).

However, this year, we took 14 flights, compared with no flights in the financial year 2023/24. Reasons for taking these flights included travelling to COP29 in Baku and to conferences in Istanbul and Copenhagen, a cancelled train necessitating a flight, and two trans-Atlantic flights due to visits from our partners in the USA, which we include in our accounting for full transparency. The full climate impact of these 14 flights (including both CO2 emissions and non-CO2 impacts) accounts for 97% of our annual travel emissions, and further confirms our decision to prioritise train travel where at all possible.

This year, we have also calculated the emissions associated with OG’s domestic travel, specifically travel for remote or Brussels-based employees travelling to our London office once a month. All of our employees travel by rail for these meetings, and over the course of the financial year these journeys caused emissions equivalent to 1,300 kg CO2. We have also included the international travel of our suppliers for the first time.

To calculate emissions, we:

1. Estimated the distance for each leg of a journey.

2. Applied the appropriate emissions factors recommended by the UK government: Greenhouse gas reporting: conversion factors 2025 - GOV.UK.

3. Accounted for both CO2 and non-CO2 emissions for aviation.

Reported emissions are accounted for in the following table.

Opportunity Green travel emissions (April 2024-March 2025)