London is certainly at the forefront of efforts by cities to lower emissions of carbon dioxide, reduce traffic and air pollution, and promote healthier lifestyles.
London is now announcing that it plans "to create a new network of quick, simple, and safe routes for cyclists and pedestrians that represents the largest investment in walking and cycling in the city’s history."
This is not some token initiative, either. London is committed to spending US$975 million over the next ten years to implement five new programs "with the aim of having one in ten round trips in London each day made by bike, and saving some 1.6 million tonnes of CO2 per year ." (Treehugger)