EC - Destruction of the Earth (Feldstein)

Destruction of the Earth
by Al Feldstein
Weird Science #14[#3] (1950)

A scientist who helped develop the atom bomb approaches some government officials to warn them about the consequences that his calculations show for their upcoming hydrogen bomb test, which you can guess from the title of the story.  They dismiss his concerns and head down to the test in the Bikini Atoll.  Does not go well.

It's a little dry but well illustrated, with some interesting scenes, and a nice little twist in the last panel.