A. One surprise is the lack of outrage by international greens at the non-action on the part of advanced countries.
B. So, imposing them at $60 per barrel is only partial and inadequate catch-up.
C. The fact is, such taxes were called for even when oil prices were above \(\$\)100 per barrel.
D. One should not be overly impressed by recent arguments made, for example, by the IMF, that the decline in energy prices offers an opportune time for advanced countries to impose carbon taxes.