&gt; The biggest problem today is global warming.<p>No it is NOT! Before catalytic converters the air in many cities was killing people constantly.<p>Global warming gets all the press, but pollution is FAR FAR worse. It will (and has killed) more people (and animals) than global warming ever could.<p>The US is very clean (relatively) right now, so you think &quot;oh everything is fine, let&#x27;s bring back some pollution&quot;. But you have NO idea.