London walking tours. Not only will you decrease your travel carbon footprint, you get a little exercise too! There are companies that are starting to see the light in respect to eco-travel. They are thinking smaller groups which means, less transportation, which means less pollution from behind those tour buses. If you are not into groups, try a London private tour. With tourism becoming one of the largest industries we all need to think about our own travel practices, try practicing the saying take only pictures leave only footprints. With a walking tours London you could do just that!