See How Volkwagen is Reducing NOx Emissions by 80%

Most people don't like diesel cars, but at one point, most experts considered them the way of the future. You could call diesel fuel as more energy-dense than regular fuel, which yields better mileage. The problem comes from NOx emissions, which have a link to cancer and other health problems. Volkswagen may have discovered a solution that will cut emissions by as much as 80 percent.