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A word or phrase that describes best a specific type of person or their behavior. The type of person that would not act upon a threat if said threat is not affecting their personal well-being directly.

Context: "Global warming becomes my problem only if I decide to believe I'll live long enough to see the consequences of it."

Proposals that are tightly related to the given context are more than welcome!

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Since you're looking for an adjective, self-centered is a good option:

From Merriam Webster:

self-centered

2 : concerned solely with one's own desires, needs, or interests.

e.g. He's so self-centered he doesn't consider global warming a threat unless it affects him directly.

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self-interest TFD

n 1. one's personal interest or advantage 2. the act or an instance of pursuing one's own interest

As in:

"Global warming becomes a self interest if I decide to believe I'll live long enough to see the consequences of it."

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If I was in a particularly wordy and euphemistic mood, I would describe that person as "pursuing a policy of personal isolationism". https://www.dictionary.com/browse/isolationism Welcome to the community!

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