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

Chrome exhaust pipeWith automotive emissions regulations again coming under political pressure, we thought we'd re run this Earth Day question from 2014 in an attempt to answer the question: Why all the fuss? Why do we still focus on green cars some 40 years after the EPA imposed the most significant emissions limits on cars? We hope it will provoke thought engender...