English: If you need to travel – either locally or abroad – what is the lowest-carbon way to do so?

In the chart here we see the comparison of travel modes by their carbon footprint. These are measured by the amount of greenhouse gases emitted per person to travel one kilometer.

This data is sourced from the UK Government’s methodology paper for greenhouse gas reporting, widely used by companies to quantify and report their emissions. Greenhouse gases are measured in carbon dioxide equivalents (CO2eq), meaning they also account for non-CO2 greenhouse gases and the increased warming effects of aviation emissions at high altitudes.2

Overall, the most efficient ways to travel are via walking, bicycle, or train.