Stay with me here.
The Silicon Graybeard brings teh smart about solar activity, sunspots, and Global Warmenning. Go RTWT. I'll wait.
It's all there, all nicely tied up with a bow. The only thing missing is the greeting card (probably carved in bloody runes on parchment with a dagger) from The Gormogons, saying "We may or may not have been playing magnetic games with the sun. Enjoy this next winter, suckers."
I mean, it's all there: The Mandarin with his solar "experiments" (and inscruitability, no extra charge), GorT for the time travel (how else do you go back in time to change - sorry, sorry: "adjust" - all the old temperature readings), and the Czar (for the bloody runes; and just where is Dat Ho, anyway?). I kind of suspect that Al Gore is actually one of The Volgi's life size anamatronic experiments, but that's really just conjecture.
It's a brilliant scheme, which just reinforces the suspicion that your Gormogons are behind it.