I'm not a huge Al Gore fan, but his heart is in the right place.
I don't think his style or appearance or whatever appeals to many people.
One problem is he grew up wealthy so he'll say things that are ridiculous to the masses, sort of like Barbara Bush saying that those homeless people in New Orleans are better off in that sports stadium because they have a place to stay. Like he says that he has offset all the CO2 his mansion produces.
In his "hockey stick" graph, if you look at it with magnifying glass, you can see it warmed up, then the CO2 went up. That graph shows that if it warms up, then CO2 levels will rise, which is an important concept, but doesn't really show what will happen if you release CO2 into the atmosphere. But it does show that there is a positive feedback mechanism - if you release CO2 and if this increases temperature, then the CO2 will rise even more which will increase temperature even more. But that's too complicated. But he shouldn't go out and say what he says, that this proves that releasing CO2 will increase temperature. Better to find something to say that's scientifically correct even if the details are too complicated to go into. But that's a different chaff thread...