At the same time, he [Obama] wanted to make it clear—to his own people and to the rest of the world—that the U.S. would use nukes first under only extremely limited circumstances. He came up with this formula: The United States would not use nuclear weapons first against countries that (a) did not possess nuclear weapons and (b) had signed, and were abiding by, the Non-Proliferation Treaty. This preserved the option of going first against what many considered the main threats—Russia, China, North Korea, and (if it ever developed a bomb, as it seemed to be doing at the time) Iran.
That became U.S. policy—and, though few noticed,
the Trump administration’s Nuclear Posture Review, signed in 2018 by then–Secretary of Defense James Mattis, preserved that language precisely.
Slate’s Use of Your Data
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Another recent study by Global Zero confirmed President Ronald Reagan’s maxim that “a nuclear war cannot be won and must never be fought”: an estimated that 30% of the total population of the top 145 biggest cities in the United States — 21 million Americans — would perish in a Russian nuclear counterattack. To put that in perspective, in the first 24 hours the U.S. death toll would be 50 times greater than all American casualties in World War II.
New ‘No First Use’ Campaign Urges All Nuclear-Armed Nations to End First Strike Policies
When combined with the prompt destruction from nuclear blast, fires, and fallout and the later enhancement of solar ultraviolet radiation due to ozone depletion, long-term exposure to cold, dark, and radioactivity could pose a serious threat to human survivors and to other species … The possibility of the extinction of
Homo sapiens cannot be excluded.
Read more:
https://www.smithsonianmag.com/science-nature/when-carl-sagan-warned-world-about-nuclear-winter-
@ thinking we're ready to combat climate change when we're still debating the consequences of nuclear war