First of all, neither made a truthful statement when they staked their claims. (They lied)
For Gore, none of his predictions have come true. He made a lot of money with dire predictions, but failed to follow any scientific method to support them.
Fauci is related to Science, albeit unsuccessfully. He was tasked with creating a vaccine for AIDS and to prevent and stop the transmission of Covid-19.
Here is what Frances Bacon has to say in The Great Instauration. He is arguing that experimentation is required to overcome the fallibility of our senses.

The scientific method is roughly described as,
The scientific method is a systematic way of learning about the world around us and answering questions, involving forming a hypothesis and then testing it with an experiment.
Neither man followed that to produce repeatable results by peers.
I’ll give you that Gore was able to get other talking heads to repeat his words, but they were by unqualified politicians and media trying to ride the coat tails of his false claims.