I don’t believe that it ever went beyond the hypothesis stage. To reach the theory stage requires quite a bit of accurate evidence that appears irrefutable.
Of course global warming is like a lot of laws passed by congress. Good for their pockets and makes liberals feel good.
Absolutely nothing “proves” Global Warming is happening or that mankind has anything to do with it. There is evidence that we are warming naturally, albeit very very slowly, because we are still exiting the last ice age.
Liberals weren’t taught scientific method in fifth grade, because that is above their ability level.