We need exactly that for the really big environmental problem - global warming. So far it's not great, only Europe has a CO2 credits system and while it's desig

We need exactly that for the really big environmental problem - global warming. So far it's not great, only Europe has a CO2 credits system and while it's designed to be plugged into a global system they're mostly a joke. But then the appeal of the likes of Green New Deals are stealing away the attention.