This article is meant to be a collection of ways to be more environmentally friendly if you have to drive. Obviously the best thing to do is to walk, bike or take public transportation. * Buy an efficient car, e.g. which uses less than 5 litres per 100 km and has particle filtre * Drive together, especially when commuting * Empty your car, free it up from things and weight that must not be carried. You know, a fully loaded Truck empties your burse. * Sell your second car and step into a local car pool club, equipped with efficient cars with particle filtres * Drive the speed limit. It saves gas, reduces emissions, and may also reduce the risk of accidents. * Tune up your car. Regular auto maintenance, including tune ups and filter changes, allows cars to run cleaner a