1. **Live car-free**: This saves an average of 2.04 tonnes of CO2 equivalent per person annually.
2. **Drive a battery electric car**: This saves 1.95 tonnes of CO2 equivalent per person annually.
3. **Take one less long-haul flight each year**: This saves 1.68 tonnes of CO2 equivalent per person.
4. **Buy renewable power and use public transport**: This ranks fourth and fifth, respectively.
5. **Insulate your home well**: This saves 0.895 tonnes of CO2 equivalent.
6. **Switch to a vegan diet**: This saves 0.8 tonnes of CO2 equivalent.
7. **Use heat pumps**: This is another effective way to reduce carbon emissions.