In the highly unlikely scenario of global warming being bogus, only a complete moron would still disagree with the view that our planet is 'in the toilet' & its in there because of 'Human activity', if you then require some kind of unit to measure 'destructive human activity', there is probably none better than 'Carbon use by weight'.
True or untrue, I don't see any downside to promoting the concept of global warming.
Down side is eventually it could lead to you paying for carbon credits or tax on things you do and use that contains carbon.. Which includes you breathing. So eventually we could get to a society that gets taxed just for living, which would turn into slavery for the poor or restrictions on how many childern.