The eco guide to bike-sharing

Cycling has the power to transform urban transport. But access to bikes is key to getting more of us on to two wheels

Imagine the huge improvement in air quality if we shifted to pedal power. In Groningen, in the Netherlands, almost two-thirds of trips are made by bike, making it one of the most cycle-friendly cities in the world. It's no accident that the Dutch city also has great air quality. The UK manages a meagre 2% cycling rate overall. And we all know about the air quality here.

If, by the way, your wheels are redundant, please pass them on to the Bike Project to match with someone who desperately wants one.