"There will come soft rains and the smell of the ground, And swallows circling with their shimmering sound;

And frogs in the pools singing at night, And wild plum trees in tremulous white,

Robins will wear their feathery fire Whistling their whims on a low fence-wire;

And not one will know of the war, not one Will care at last when it is done.

Not one would mind, neither bird nor tree If mankind perished utterly;

And Spring herself, when she woke at dawn, Would scarcely know that we were gone."

- Sara Teasdale, 1918

Didn't see the inspiration for Bradbury mentioned here. I love this poem. There's also a great song-rendition of it by The Three D's, a folk group popular in the 50's.