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As do all the sources used by climate change denialists.

My sense of the perpetrator’s purpose

40% Climate Skeptic/Fake News to cast a poor light on climate protesters
40% Climate Protester of Christy/Spencer’s climate denialism.
20% Random Shooting

Roughly speaking.

But regardless of this outcome, my sense of the threat of the Global Warming/Climate Change Issue

100% for the Alarmist side
0% for the Skeptic side

I would disagree. Limbaugh is not a scientist. He's a radio deejay whose got into the business playing plastic discs and telling people the names of the songs they heard. He is a commentator of all subjects, and a master of none, including global warming.