It would have been pointless 10 years ago ,just as pointless today. It's just politics ,dress up in green camo , to give a veneer of environmentalism. If the need is so great ,why wait over a year to implement a tax that only starts at $10/ton and will do nothing to slow down consumption?
Do the liberals really think this will get the extreme environmental groups on side? Boy are they in for a surprise. They are only interested in shutting down all pipeline construction , then maybe going after the existing ones.
So what has happened in the last decade to justify the continued vilification of CO2  ? Nothing . But the planet has gotten greener.....can't have that real world evidence, can we?.....