Newest, cleanest diesels in Europe can still be very dirty: analysis

It has become increasingly more evident that carmakers must take aggressive steps to ensure that diesel cars and light trucks meet current environmental regulations. Tests done by Emissions Analytics found that the majority of new diesel-powered cars sold in Europe do not meet the Euro 6 emission standards for nitrogen oxides (NOx) in real-world use.

When will we see ‘tailpipes’ on cars as morally wrong? An Earth Day question

Economists call them “externalities.” They’re the costs of people’s actions on other people or communities—though the people taking those actions don’t have to pay for those costs, even as they harm others. The emissions from combusting fossil fuels to propel vehicles are clearly a prime example. While complaints about air quality in the Los Angeles Basin