European Mobility Week has some 800 cities in countries around the world signed up to participate — more than 1,000 geared up for the end-of-the-week car-free day. That will be on September 22. The aim is to encourage people to choose ways of getting around that reduce their contribution to climate change. Although France and Spain are making by far the strongest showing, hundreds fewer cities are doing it than last year. Cars are responsible for more than 10% of the EU’s emissions of climate-changing greenhouse gases. They also produce air pollutants that can harm human health and the environment. The sustainable urban mobility initiatives during the week will encourage people to make greater use of more eco-friendly alternatives.