What "smells like fascism"?
Doom is barreling down on us at an unprecedented rate. We have to turn over huge new powers to government to avoid this doom. Government will create huge new bureaucracies to combat the doom. The huge new bureaucracies will be financed by huge new taxes. The bureaucracies will control huge new swaths of business. Businesses will fund huge new lobbyists. Bureaucracies will create huge new regulations. Huge new regulations and huge new lobbyists will be funded through price increases. Huge new portions of subject populations' income will be devoted to governments, bureaucracies, and business. That smells like fascism.
One thing's for sure. If we don't do something about AGW all of those things will come to pass as the effects become more and more evident and people start demanding action.
On the other hand we could just impose a gradually increasing carbon tax* that would require a relatively small bureaucracy to administer and have the effect of making non-carbon energy sources more attractive as time goes on.
*The carbon tax should be imposed at the well/mine head or point of import of fossil fuels and possibly a tariff on imports from high carbon emitting countries. The carbon tax's proceeds should be distributed as an equal dividend to all legal US residents. The would have the effect of easing the tax's burden on low income residents and penalizing high carbon producers. The existing IRS could handle the dividend part of it.