> Well why don’t they just lower it to zero?? As usual, no consideration given to the costs/downsides. For the same reason we haven't dropped fossil fuel use o

> Well why don’t they just lower it to zero?? As usual, no consideration given to the costs/downsides. For the same reason we haven't dropped fossil fuel use overnight: It's not practical. You can't just wave a magic regulatory wand to elimination all air pollution without expecting (severe) economic impacts.