Clean Diesel

​Electric vehicles are hitting the roads in greater numbers every year, but in the meantime, scientists are working on ways to clean up existing fossil fuels. A new refining process uses a potassium catalyst to reduce the amount of sulfur in gasoline and diesel to a fraction of their current levels.

In what might be a case of two wrongs making a right, an Australian startup has shown that it is possible to get a cleaner blend of fuel by combining oil derived from old tires with diesel. ​

Just weeks after producing its first batch of synthetic diesel fuel made from carbon dioxide and water, Audi has laid claim to another synthetic, clean-burning and petroleum-free fuel called "e-benzin." The fuel was created by Audi's project partner Global Bioenergies, in France.