Scientific evidence shows that the climate is changing. As we burn fossil fuels we increase the amount of climate change gases in the atmosphere. The most common of these is carbon dioxide (CO2). Climate change is the world's greatest environmental challenge. Transport accounts for around a quarter of the man-made greenhouse gas emissions from the UK. These travel pages provide information and advice on numerous ways we as individuals can help to reduce the impact travel has on the environment. From walking or cycling more, to changing the way we drive, small changes made by all of us can help to make a big difference. The environment isn't the only thing to benefit from sustainable travel. On average, 15% of household spending is on transport, almost as much as on food or housing. Most cars cost over £50 a week. Regular walking or cycling makes you fitter - as fit as an average person 10 years younger. Traffic jams are common and journey times are rising in urban areas. Britons spend an average of an hour a day travelling. Persimmon Homes and Barratt Homes aim to reduce the impact of new development on the environment wherever possible through the use of modern building techniques and practices. This website is just one part of the Stella Travel Plan, which aims to reduce the impact travel generated by residents has on the environment, providing individuals with all they need to reduce their carbon footprint.