The utter failure of recent efforts to alarm the American public about carbon dioxide

I think it's quite remarkable that a recent Gallup poll showed that Americans are less concerned about global warming now than they were in March 2007.

Some examples of all-out efforts to "raise awareness" since March 2007:

A Step It Up National Day of Climate Action was held in April 2007.

The Live Earth concerts were held in July 2007.

Leonardo DiCaprio's alarmist film "11th Hour" was released in August 2007.

Al Gore and the IPCC were awarded the Nobel Peace prize (October 2007)

AP claims that'The Arctic is screaming' and the Northwest Passage had opened "for the first time ever" (Dec. 2007)

Much hype about a large alarmist junket in Bali (Dec. 2007)

On the hype scale of 1-10, UN chief Ban Ki-Moon turned the knob to 11 with the "oblivion" and "even more terrifying" than "science fiction movies" quotes here. (Nov/Dec 2007)

A huge "Focus the Nation" event was held in late January 2008.

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What can Gore do to raise the American public's concern about global warming? I think the answer is "nothing".

The alarmists have already thrown everything including the kitchen sink at the public, and the people continue to yawn.

I think the US public's concern peaked in early 2007, and it's all downhill from here. From an alarmist's perspective, I think additional advertising, media hype, etc is essentially all for naught. Raising the general public's "awareness" has already been done; it has spurred many people to dig into the subject, and when they do so, most figure out pretty quickly that the scientific case is weak.

A very critical point is this one:

...more informed respondents both feel less personally responsible for global warming, and also show less concern for global warming.