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In America, professors who study this stuff could typically get more money doing other things. If profs were after money they'd just go get a private industry job. This is such a rubbish angle to attempt to discredit global warming.
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In academia proper there are a higher percentage of individuals who are relatively more driven by philosophical considerations than by money. 'Global warming' is one of a family of issues with marketing tailored to this segment.
Some scientists fall victim to the (almost certainly false) belief that they are working toward a sort of a Utopia which is heavily influenced by scientists like themselves because management of the Utopia leverages their talents. This is the line they are fed by those with a deeper understanding (and deeper pockets.) In the more immediate space, there is a practical need for grants, career advancement, spending money, etc. Scientist are, at their core, also human after all, and there is an obvious correlation between success and failure in academia and the willingness to promote or damage the party line on 'climate change.'
https://climatism.wordpress.com/2014/01/24/in-searching-for-a-new-enemy-to-unite-us-we-came-up-with-the-threat-of-global-warming/