Why Al Gore returns with new climate campaign?

They are getting desperate as their credibility is running out. Now they must milk it for everything they are ever going to get out of it.

The industries that produce AGW causing CO2 are funding a huge campaign to cast doubt on AGW, despite the fact that virtually all scientific organizations on earth have concluded that AGW is real. These industries have also "purchased" congressional representatives, (mostly Republican). This industry campaign of lies and distortions needs to be counteracted, and Al Gore has stepped up to the plate.

Needs money to pay for that home on the beach. But really, only a previous plan that was untrue needs to be changed.

must be low on cash and needing some face time in the news

To head a new conspiracy fomenting grammatically correct English.

Because he has his vested interest which is hidden?

I dont see any political agenda attached to it. looks like he is really onto saving planet earth.