Driving. When you are not killing people quickly in accidents, you are killing them slowly with particulate pollution. And if that's not enough, you are also

Driving. When you are not killing people quickly in accidents, you are killing them slowly with particulate pollution. And if that's not enough, you are also making a big contribution to global warming, an existential threat to our civilisation. It is unconscionable! This is what people will say in the future anyway. You can make your own mind up.