German car manufacturer used renewable energy to convert carbon dioxide and water into 'blue crude ' oil which was then refined into diesel . The carbon dioxide can be removed from the air or from power plants . Audi claims its e-diesel is carbon neutral without adding to climate change . Comment:
German car manufacturer used renewable energy to convert carbon dioxide and water into 'blue crude ' oil which was then refined into diesel . The carbon dioxide can be removed from the air or from power plants . Audi claims its e-diesel is carbon neutral without adding to climate change . Tests suggest it allows cars to run quieter and produce fewer pollutants .