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As for how much has been spent by Governments in support of the narrative of Human caused catastrophic climate change,
I found this reference.
The misallocation of climate research funding
1.3 trillion is the total amount of science grants since 1950, that only very small share of that went to climate change research. From your source:
“The second observation is how little funding has gone into research on climate change overall since 1990, regardless of discipline. Depending on which search string one uses, climate research accounted for between 2.38 and 4.59% of the total amount of research funding during the period from 1990 to 2018. The higher estimate errs on the high side: very few projects that are really about climate change would not include any of the 89 keywords in the long search string, whereas numerous projects that happen to mention one of those words may not really be about climate change.”
So why would leading universities and scientific organizations risk their reputation for such a small share of total grants? Especially since lost credibility would cost so much more in overall reduction of grants. Also remember that Republican politicians, that oppose action on climate change, have controlled the White House and / or Congress for much of that time period.
While just the five biggest oil companies have made a profit of 281 billion since the invasion of Ukraine.

World’s largest oil companies have made $281bn profit since invasion of Ukraine
Global Witness says the five ‘super-majors’ are the ‘main winners of the war’ while many struggle to heat their homes