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So let's get back to the discussion of GW. Why does it matter if its real or not? Will the solution come through talking about the problem and lightbulbs? Or are the problems of the possibility of GW already being addressed by private industry (and government funding of research)? What should the government do differently if GW is indeed happening?

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You answered your own question. Basically, do what Al Gore is doing but more of it.

No one thinks this can be addressed by just light bulbs. Instead, you should think of the light bulbs as a symbol of the need to adopt new technologies at a faster rate than we otherwise would.

The discussion is needed because no one is going to act if they don't know that they should.

And government is needed because as long as the benefits of pollution are private and the costs of pollution are collective, individual people and companies will continue to pollute at a rate above the economic ideal. The only bodies that could correct this are governmental.