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"She has succeeded in creating a global attitudinal shift, transforming millions of vague, middle-of-the-night anxieties into a worldwide movement calling for urgent change. She has offered a moral clarion call to those who are willing to act, and hurled shame on those who are not."

Thunberg was chosen among a group that included the Hong Kong protesters, House Speaker Nancy Pelosi and President Donald Trump.

And it's the last name on that list who will be most aggrieved, not only because he was not chosen but also because Thunberg, well, was.

Start here: Trump has long had an obsession with Time's person of the year -- dating back long before he was President.

So, Trump cares a lot about who Time picks. (Why? Because the vast majority of his conceptions of success, fame and power were established in the 1980s. Being on the cover of a magazine -- particularly one like Time -- was a sign that you'd made it. And Trump likes visible signs that he's a big deal.)

Which brings us to Thunberg, who rose to fame when she began what she called "climate strikes" in her native Sweden to protest the lack of action by governments around the world to address the threat posed by climate change.

Earlier this fall, she spoke to the United Nations General Assembly, scolding the assembled leaders in blunt terms about their inaction on climate and what it would cost them -- and her.

"People are suffering, people are dying, entire ecosystems are collapsing," Thunberg told the UN audience. "We are in the beginning of a mass extinction and all you can talk about is money and fairytales of eternal economic growth."

So the combination of being passed over (again!!) and Thunberg being Time's pick will annoy Trump. A lot.

Will he lash out via Twitter? I'm not a betting man, but, well, yes.

More:
Why Time picking Greta Thunberg will drive Donald Trump crazy - CNN