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It was Danish physicist Henrik Svensmark!

I found a link to the article I read, but you have to subscribe to read the whole thing:

Weather from Outer Space

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Now I found the interview, in its entirety:

Discover Interview Sun's Shifts May Cause Global Warming

He's not in his eighties, he's in his fifties, but he doesn't really care if his theory is politically unacceptable. He just cares that it is correct.