Solar roofs (photovoltaic cells) on houses in Vauban, a sustainable suburb of Freiburg im Breisgau, Germany. Alamy 2S4J9CD

Cyclists and pedestrians in the (mostly) traffic-free centre of Delft, The Netherlands. Alamy PW8FBC

A view through the arch of the Bell Tower of Evesham Abbey, Worcestershire. Alamy M6BEM0

Wind turbines and hazy winter sun, near Grevenboich, Germany. Alamy 2RCBDBG

ULEZ sign at the end of Oxford St. London (then the ULEZ boundary). Alamy WMXRC9

Gas-fired power station, Shoreham-by-Sea, East Sussex. Alamy 2WXFBYM