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In 1993, when I was an intern at Lawrence Livermore National Labs, visiting Exxon scientists came to present about global warming, which of course they knew existed. nytimes.com/2023/01/12/climate/exxon-mobil-global-warming-climate-change.html
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The subject of the Exxon presentation was that we could counterbalance fossil fuel emissions by "changing the alkality of the oceans" through massive lime dumping. The estimated cost, around $700B/year.
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Of course such an expenditure is only imaginable if global warming was (1) real and (2) likely to be enormously damaging. Everyone on the room, whether they worked for Exxon or the US government knew that was true.
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Meanwhile, every Sunday, I could read the Exxon ads in the New York Times claiming that there was in fact no rise in global temperatures at all. Exxon knew they were lying, and paid scientists to keep track of the truth at the same time.