That’s what researchers in the US discovered when they set out to explore how to prompt pro-environmental behaviour. They set up signs at a petrol station inviting passing motorists to have a free tyre check, offering either financial, safety or environmental reasons for doing so. The forecourt sign saying ‘Care about your finances? Get a free tire

On average, a 10 percent reduction in energy use in certified buildings results in an increase of 1.1–1.2 percent in market value.