The "inconvenient truth" about Al Gore is that he's wedded to the same neo-liberal policies that helped get Trump elected in the first place. Regarding his environmental actions( his attraction to oh so many liberals) If he and his corporate cronies can make a buck off it( carbon credits, for example) fine, if it gets in the way of making bucks then too bad for the environment. With someone like Trump, when it comes to the environment, you at least have an honest enemy, while Gore's "green credentials" garner him a pass from the easily fooled. As is almost always the case, follow the money.  That is the true green that Al Gore pays allegiance to.

https://www.counterpunch.org/2017/08/04/the-inconvenient-truth-about-al-gore/