The title of their article: What It Would Really Take to Reverse Climate Change
But apparently neither highly educated individual has ever heard of Gen IV Breeder Reactors (be they IFRs or MSRs).
They have no problem in acknowledging James Hansen as "...one of the world's foremost experts on climate change..." and using Hansen's climate model.
Maybe they should follow Hansen's thinking on "what it would really take" - and get themselves involved with Hansen in the activities of:
Science Council for Global Initiatives