Four debates and no mention of "climate change"

This year, for the first time since 1984, global warming climate change was not mentioned in any of the debates in the presidential contest.

The reason that Romney and Ryan didn't bring it up seems clear: their strategy for winning is to have the electorate to focus on the economy.

But why didn't Obama or Biden mention it?  Climate change, including funding "green energy" and attempting to pass cap-and-trade, was a central focus of their first term.  Further, Democrats claim that anyone who rejects the catastrophic global warming climate change theory is an anti-science luddite.  So, why not mention it?  One suspects that they know that the public is not buying into it like it used to.

REMINDER: Over 30,000 American scientists, including over 9,000 Ph.D.s, have publicly signed this petition skeptical of global warming alarmism.

MORE: A video history of global warming in presidential election year debates going back to Bentson-Quayle is here.

PREVIOUSLY on eco-hypocrisy:
•Obama is not carbon neutral II
•Pres. Obama is not carbon-neutral
•Study: Environmentalists more likely to "cheat" and "steal"
•The UN's global warming advocates vs. their own carbon footprint
•Eco-hypocrite of the day: supermodel Giselle
•The ever-increasing energy use of Al Gore's mansion
•With five private jets, Travolta still lectures on global warming.

PREVIOUSLY on the public response to global warming:
•Global warming provokes laughter, even in the San Francisco Bay Area
•Public not buying UN IPCC propaganda 

PREVIOUSLY on this Fall's debates:
•Obama-Romney final (3rd) debate recap: who won?
•Romney-Obama 2nd debate: instant poll results on who won
•Biden-Ryan VP Debate: Instant poll results on who won 
•2nd debate: Did Obama really call Benghazi an "act of terror"?
•VP Debate follow-up: White House claims ignorance as its defense