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"`Be fruitful and become many and fill the earth and subdue it, and have in subjection the fish of the sea and the flying creatures of the heavens and every living creature that is moving upon the earth.'"
For the earth to become completely destroyed by the nations would run contrary to His purpose. The Bible assures us that God will "bring to ruin those ruining the earth." (Rev. 11:17, 18)
God will not allow the earth to become completely and permanently ruined because Ps. 37:29 says that "The righteous themselves will possess the earth, and they will reside forever upon it."
For more, see:
Will planet Earth be destroyed in a nuclear war? (rs p. 112-p. 117; Watchtower Online Library)
Nuclear War—Is It Still a Threat? (g04 3/8 pp. 3-4; Watchtower Online Library)
Nuclear War—Who Are the Threats? (g04 3/8 pp. 4-7; Watchtower Online Library)
Nuclear War—Can It Be Avoided? (g04 3/8 pp. 8-9; Watchtower Online Library)
“The War to End All Wars” (w08 4/1 pp. 3-4; Watchtower Online Library)
Doomsday Fears Loom Large - Nuclear War (g 9/12 pp. 4-7; Watchtower Online Library)
What Do Many Fear? The threat of nuclear war remains high (w10 8/1 pp. 3-4; Watchtower Online Library)