Leaving your car running will marginally increase CO2 emissions, but it may massively reduce exposure to the toxic gases and particulates that are shortening thousands of lives.
How could a company like Volkswagen knowingly violate US air-pollution standards despite the senseless risks to which it was exposing its reputation? The case method can provide an answer.
Researchers funded by VW, Daimler and BMW are accused of testing diesel fumes on monkeys and humans.
Politicians need to get serious about the steady drip of scandals.
It's about time Europe ditched the diesels – so what are the alternatives?
Fallout from the Volkswagen case shows how scandals can give virtuous organisations a competitive edge and help industries evolve.
A powerful diesel lobby and fragmented class action laws put EU consumers at a disadvantage.
Diesels typically have good fuel economy, but hot on the heels of the Volkswagen affair, Australia is set to tighten the rules for diesel car emissions - which will put a dent in engine performance.
Can VW rebuild public trust? Its survival may depend on repairing the image damage caused by deception over clean diesels.
Current clean diesel technology is more than capable of meeting tough air quality rules while still delivering excellent fuel performance. Biofuels could make it even cleaner.