A Quote by Carl Sagan

You probably don't need more weapons than what's required to destroy every city on earth. There's only 2,300 cities. So, the United States, by that criteria, only needs 2,300 nuclear weapons - well, we've got more than 25,000!
What is the only provocation that could bring about the use of nuclear weapons? Nuclear weapons. What is the priority target for nuclear weapons? Nuclear weapons. What is the only established defense against nuclear weapons? Nuclear weapons. How do we prevent the use of nuclear weapons? By threatening to use nuclear weapons. And we can't get rid of nuclear weapons, because of nuclear weapons. The intransigence, it seems, is a function of the weapons themselves.
The cavalier casual way that Donald Trump talks about nuclear weapons is not only frightening but it goes counter to more than 70 years of bipartisan, presidential leadership of Republicans and Democrats who believed that we have to prevent other countries from getting nuclear weapons and we have to do what we can to decrease the number of nuclear weapons in the world.
Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea.
Basically [United States and France] said "We will use nuclear weapons whenever it suits our purposes to do so." So this expansion of doctrines regarding possible use of nuclear weapons makes them more, you know, sort of, salient and important and so it's increasing the perceived political value of nuclear weapons and therefore causing or contributing to possible proliferation.
The worst part of what we heard Donald [trump] say has been about nuclear weapons. He has said repeatedly that he didn't care if other nations got nuclear weapons, Japan, South Korea, even Saudi Arabia. It has been the policy of the United States, Democrats and Republicans, to do everything we could to reduce the proliferation of nuclear weapons.
With all of the history of war, and the human race's history unfortunately has been a good deal more war than peace, with nuclear weapons distributed all through the world, and available, and the strong reluctance of any people to accept defeat, I see the possibility in the 1970's of the President of the United States having to face a world in which 15 or 20 or 25 nations may have these weapons.
It is my fervent goal and hope... that we will someday no longer have to rely on nuclear weapons to deter aggression and assure world peace. To that end the United States is now engaged in a serious and sustained effort to negotiate major reductions in levels of offensive nuclear weapons with the ultimate goal of eliminating these weapons from the face of the earth.
Every day Saddam remains in power with chemical weapons, biological weapons, and the development of nuclear weapons is a day of danger for the United States.
Do I really want to do a mobile game that's one of 300,000, where discoverability is everything? You really have to have a little more sizzle on the steak. I would rather be one of 100 apps for Google Glass than one of 300,000 for iOS and Android.
One of the greatest concerns that I had when I became President was the vast array of nuclear weapons in the arsenals of the United States and the Soviet Union and a few other countries, and also the great proliferation of conventional weapons, non-nuclear weapons, particularly as a tremendous burden on the economies of developing or very poor countries.
We have a legal and moral obligation to rid our world of nuclear tests and nuclear weapons. When we put an end to nuclear tests, we get closer to eliminating all nuclear weapons. A world free of nuclear weapons will be safer and more prosperous.
I think Donald Trump is very, very cautious about nuclear weapons, and he's seriously concerned. And this might be one of the reasons he wants to deal with Putin carefully, because he's aware of how many nuclear weapons Putin has, and that Russian doctrine is much more open about using nuclear weapons than is American doctrine.
It is my view that there is no sensible military use for nuclear weapons, whether "strategic" weapons, "tactical" weapons, "theatre" weapons, weapons at sea or weapons in space.
Nuclear weapons are infinitely less important in our foreign policy than they were in the days of the Cold War. I don't think we need nuclear weapons any longer.
Everybody says, "Well, if it's a democracy, let them have nuclear weapons." America is the only country that has ever used nuclear weapons. We're the only ones, this democracy, our great democracy.
I don't want to use the term "nuclear weapons" because those people in Iran who have authority say they are not building nuclear weapons. I make an appeal to the countries who do have nuclear weapons. They don't consider them a nuclear threat. But let's say a country that doesn't have nuclear weapons gets involved in building them, then they are told by those that already have nuclear weapons that they oppose [such a development]. Where is the justice in that?
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