Cutting your own emissions does more for the climate than any carbon credit, and the main offsetting guidelines put it first. The trick is to focus. A few changes to travel, home energy and food usually outweigh dozens of small habits put together.

This page is part of our carbon footprint section. If you don’t know your biggest sources yet, start with the carbon footprint calculator.

Which changes save the most?

The best evidence comes from a 2020 review of 53 studies, which compared 61 consumption options by how much CO₂e they save per person a yearSource 1. The headline results:

Scrolls sideways to show every column.

Personal changes with the largest measured savings, as of October 2026
ChangeAreaMedian saving (t CO₂e per person a year)
Live car-freeTravelMore than 1.7
Switch to a battery electric carTravelMore than 1.7
One fewer long return flightTravelMore than 1.7
Switch to renewable electricityHome1.6
Refurbish and renovate your homeHome0.9
Adopt a vegan dietFood0.8

As of Oct 2026 · Source: [1] Ivanova et al., Environmental Research Letters 2020

Together, the review’s top ten options averaged 9.2 tonnes of CO₂e per person a year, with the largest potential in high-income settingsSource 1. Your own savings depend on where you live and what you replace, so treat these as a guide to where to look first.

The IPCC reached a similar view at global scale. It found that demand-side measures could cut emissions from end-use sectors by 40–70% by 2050 compared with baseline scenarios, and that people with high socio-economic status have the highest potential to reduce emissionsSource 2.

Travel

Travel heads the list. Three of the top options in the review are about travel: living car-free, switching to a battery electric car and flying lessSource 1.

  • Fly less, especially long-haul. One fewer long return flight saves a median of more than 1.7 tonnesSource 1. Check a trip with our flight emissions calculator.
  • Take the train where you can. Our World in Data puts a domestic flight at about 246 grams of CO₂e per passenger-kilometre, against about 35 grams for national rail, and estimates that the train cuts that journey’s emissions by around 86%Source 3.
  • Drive less, or switch. Walking, cycling, shared and public transport, and electric cars are among the low-emission options the IPCC listsSource 2.

More detail, with emissions per 1,000 km by mode: reduce your travel footprint.

Home

Home energy is the second big area.

  • Switch to renewable electricity. This had a median saving of 1.6 tonnes a year in the review, the highest in the housing domainSource 1.
  • Refurbish and renovate. Refurbishment and renovation had a median saving of 0.9 tonnesSource 1.
  • Heat and cool more efficiently. The IPCC lists adaptive heating and cooling choices and building-integrated renewable energy among the options people can adoptSource 2.

Heat pumps, renovation and everyday habits are ranked in reduce your footprint at home.

Food

Diet is the largest lever for food. In the review, a vegan diet saved an average of 0.9 and a median of 0.8 tonnes of CO₂e per person a yearSource 1. You don’t have to go all the way: the IPCC points to balanced, sustainable healthy diets and less food waste as options that cut emissionsSource 2. See reduce your food footprint for emissions by diet group.

Start with the swaps you’ll keep

A change you stick with for years beats a bigger one you drop after a month. Pick one change from travel, home and food, and build from there.

Shopping and digital

The things you buy, including phones, laptops and other devices, carry emissions from making and shipping them. The IPCC highlights sustainable consumption through the intensive use of longer-lived, repairable productsSource 2. In practice:

  • Buy less, and buy to last. Keep devices, clothes and furniture longer, repair them, and buy second-hand where you can.
  • Choose durable over disposable. A product used for twice as long spreads its manufacturing emissions over twice the years.

Our guides to shopping and your digital footprint go further.

Personal action and policy

Individual changes are easier when the right options exist. The IPCC found that, with policy support, socio-cultural options and behavioural change could cut global emissions from end-use sectors by at least 5% rapidly, with most of the potential in developed countries, and more by 2050 when combined with better infrastructureSource 2. It also found that people with high socio-economic status contribute disproportionately to emissions and have the most potential to cut them, as citizens, investors, consumers, role models and professionalsSource 2.

So beyond your own footprint, the changes that help other people cut theirs count too, often by more than you might expect: supporting better public transport and cycling routes at work or locally, asking your employer about its emissions, and choosing where your savings and pension are invested.

What to do next

  1. Step 1: Measure

    Use the footprint calculator to find your two or three biggest sources.

  2. Step 2: Cut the biggest first

    Pick the changes above that match those sources, starting with travel and home energy.

  3. Step 3: Offset what’s left

    For emissions you can’t yet avoid, buy and retire credits, and describe them as a contribution.

The order matters. The Oxford Offsetting Principles start with reducing your own emissions to minimise the need for offsettingSource 4, and the SBTi says credits never count as reductions towards a company’s targetsSource 5. Reduce vs offset explains where credits fit once you have cut what you can. To see how your footprint compares, check the average carbon footprint by country.