"Only after the science was discarded in favor of political efforts " That happened in '88, and you've chosen the political side of the argument.
In 1991, a US corporate coalition including the National Coal Association, the Western Fuels Association and Edison Electrical Institute created a public relations organization called the " Information Council on the Environment" (ICE). ICE launched a $500,000 advertising campaign to, in ICE's own words, "reposition global warming as theory (not fact)." Critics of industry groups have charged that the claims about a global warming controversy are part of a deliberate effort to reduce the impact any international treaty, such as the Kyoto Protocol, might have on their business interests. [43]
en.wikipedia.org
“God Bless Trump”: 25 Years Ago This Man Kick Started the First Fossil Fuel–Funded Campaigns to Attack Climate Science In July 1988, on page 11 of Sports Illustrated magazine, one story caught the eye of Fred Palmer.
Under the headline “ The Foul, Hot Summer,” the article lamented that year’s scorching heat and drought.
“We have only ourselves to blame for this midsummer's nightmare. Burning fossil fuels has created many of these environmental ills,” the story read.
Palmer was worried. As the boss of Western Fuels Association (WFA), a co-op of coal power generators and haulers, this self-confessed “prairie populist” could see the writing on the wall for his industry. Message 30964189
= "All I've ever asked for is convincing science and I just haven't seen it as yet. " It looks like this:

You can read it here: ipcc.ch |