In 1988, NASA’s James Hansen and Colorado Senator Tim Wirth sabotaged the air conditioner in a Senate hearing room in order to prove global warming.
And did you also alter the temperature in the hearing room that day?
… What we did it was went in the night before and opened all the windows, I will admit, right? So that the air conditioning wasn’t working inside the room and so when the, when the hearing occurred there was not only bliss, which is television cameras in double figures, but it was really hot. … So Hansen’s giving this testimony, you’ve got these television cameras back there heating up the room, and the air conditioning in the room didn’t appear to work. So it was sort of a perfect collection of events that happened that day, with the wonderful Jim Hansen, who was wiping his brow at the witness table and giving this remarkable testimony.
Interviews – Timothy Wirth | Hot Politics | FRONTLINE | PBS
Twenty years later, Hansen hoped for a repeat, but it was a nice cool day. Hansen said “We were just lucky”

The Day – Google News Archive Search
As is normally the case, Hansen had absolutely no clue what he was talking about. 1988 was the peak year for hot days in DC, which have plummeted since.

The 99 degree temperature On June 23, 1988 was the hottest on record. Hansen’s second testimony in 2008 was a typical pleasant 85 degrees.

They no doubt scheduled the 1988 hearing based on the hot weather forecast, the hottest day of the month.

There was zero substance to Hansen’s testimony. A mixture of incompetence and fraud which is still the standard for all government climate science.