Given global fossil fuel trajectories, I agree with Joe Romm here: 

Yes, it is increasingly unlikely that we will adopt the aggressive but low-net-cost policies needed to stabilize at 450 ppm atmospheric concentrations of carbon dioxide, and then quickly come back to 350… (the rest).

But his “shame on you” blame-game reason for why this is the case…

— thanks in large part to the deniers, along with their political pals and media enablers. 

…is utterly inadequate when you consider deep human dependence on fossil energy norms and behavioral “near and now" realities.