Tornado Alley (PROG)

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How did the global-warming-alarmists accurately measure the sun's heat output past, present, and future?

Or, how did they control the experiment in order to obtain an accurate measurement of the sun's heat output past, present, and future?

The alarmists could be off by several degrees to the warm side.

note: the "Say it, Say it" remark was in jest in reference to the movie "Back to School" and Sam Kennison getting in Rodney Daingerfield's ear.