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Well.... one of the worst of those eco-hysterics has just served 8 years as Obama’s chief “science advisor” and is now cozily back in academe:

https://www.hks.harvard.edu/about/faculty-staff-directory/john-holdren

[Enchante]

btw, Holdren's bio at Harvard claims that he has

"a Ph.D. from Stanford in aerospace engineering and theoretical plasma physics"

I'm no scientist but I think that "aerospace engineering" and "theoretical plasma physics" are very very separate disciplines. Normally they are not even in the same graduate school, since engineering disciplines are usually quite separate in academic bureaucracy from the "natural sciences" including physics.

Surely it is not possible to do one doctoral dissertation that could satisfy requirements in both of those fields. I find this extremely unlikely at best.

Perhaps Holdren is guilty of some serious embellishment of his credentials here, to sound more impressive. Possibly he took some course in both fields, but I doubt that he has a PhD that was granted in both fields.