Which 20th century poet said: "This is the way the world ends, not with a bang but a whimper."?

This was immediately following WW1, when much of the population was disillusioned and pessimistic.

Whimper in some ways (everyone will be too busy looking at their phones) and a bang with the weather!

Considering the climate of the time, it is more likely to end with that big bang than a whimper.

This quote is on the first page of The Stand.

Angst and ennui.