The authors of the study urge the public to contribute by adopting the carbon-cutting measures in the report, which is based on an analysis of 7,000 other studies.

Top of the list is living car-free, which saves an average of 2.04 tonnes of CO2 equivalent per person annually. This is followed by driving a battery electric car – 1.95 tonnes of CO2 equivalent per person annually – and taking one less long-haul flight each year – 1.68 tonnes of CO2 equivalent per person. Switching to a vegan diet will help – but less than tackling transport, the research shows. It says popular activities such as recycling are worthwhile, but don’t cut emissions by as much.

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