War contributes greatly to global warming, which shouldn’t surprise us. All those bombs going off, all those rockets, all those planes and helicopters. All that fuel of various kinds being used. It pollutes the air and water of this very fragile and interconnected planet.

In remembering the appalling suffering of war on both sides, we recognise how precious is the peace we have built in Europe since 1945.

I’ve grown accustomed to hotels and drastic climate change.

The Washington leadership has put aside non-proliferation programmes and devoted its energies and resources to driving the country to war by extraordinary deceit, then trying to manage the catastrophe it created in Iraq.

It was times like these when I thought my father, who hated guns and had never been to any wars, was the bravest man who ever lived.

We must concentrate not merely on the negative expulsion of war but the postive affirmation of peace.

One of the good things about the way the Gulf War ended in 1991 is, you’d see the Vietnam veterans marching with the Gulf War veterans.

The thing that’s made me open my eyes to what was happening to the environment and climate was films and documentaries.

War is the domain of physical exertion and suffering.

America means far more than a continent bounded by two oceans. It is more than pride of military power, glory in war, or in victory. It means more than vast expanse of farms, of great factories or mines, magnificent cities, or millions of automobiles and radios.

I think my message to the politicians who have within their power the ability to make change is, ‚Do you really, really not care about the future of your great-grandchildren? Because if we let the world continue to be destroyed the way we are now, what’s the world going to be like for your great-grandchildren?‘

If you look back at the history of the twentieth century, Germany alone had practically destroyed Russia several times.

We’re running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere… can handle before there is an environmental catastrophe.

We should no longer measure our wealth and success in the graph that shows economic growth, but in the curve that shows the emissions of greenhouse gases.

War may sometimes be a necessary evil. But no matter how necessary, it is always an evil, never a good. We will not learn how to live together in peace by killing each other’s children.

In war as in life, it is often necessary when some cherished scheme has failed, to take up the best alternative open, and if so, it is folly not to work for it with all your might.

Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.

The operations of the federal government will be most extensive and important in times of war and danger; those of the state governments, in times of peace and security.

People like to talk about war.

You can kill ten of our men for every one we kill of yours. But even at those odds, you will lose and we will win.

Even today we raise our hand against our brother… We have perfected our weapons, our conscience has fallen asleep, and we have sharpened our ideas to justify ourselves as if it were normal we continue to sow destruction, pain, death. Violence and war lead only to death.

War should only be declared by the authority of the people, whose toils and treasures are to support its burdens, instead of the government which is to reap its fruits.

Sectional football games have the glory and the despair of war, and when a Texas team takes the field against a foreign state, it is an army with banners.

There is so much that must be done in a civilized barbarism like war.

Peace is not the absence of war, but a virtue based on strength of character.

We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

We will have to leave this planet, and we’re going to leave it, and it’s going to make this planet better.

The constitution vests the power of declaring war in Congress; therefore no offensive expedition of importance can be undertaken until after they shall have deliberated upon the subject and authorized such a measure.

It is our duty still to endeavor to avoid war; but if it shall actually take place, no matter by whom brought on, we must defend ourselves. If our house be on fire, without inquiring whether it was fired from within or without, we must try to extinguish it.

A lot has happened over the years. And while this nation has been tested by war, and it’s been tested by recession and all manner of challenges – I stand before you again tonight, after almost two terms as your president, to tell you I am more optimistic about the future of America than ever before.

The shift to a cleaner energy economy wont happen overnight, and it will require tough choices along the way. But the debate is settled. Climate change is a fact.

The essential act of war is destruction, not necessarily of human lives, but of the products of human labor.

The reason we should do a carbon tax is because it’s the right thing to do. It’s economics 101, elementary stuff.

It is not enough to say we must not wage war. It is necessary to love peace and sacrifice for it.

Morality is contraband in war.

In 1962, war was avoided by Khrushchev’s willingness to accept Kennedy’s hegemonic demands.

Peace is not only better than war, but infinitely more arduous.

In war, events of importance are the result of trivial causes.

Throughout my career, I learned plenty about war on the battlefield, but I learned even more about the importance of finding peace. And that is what the State Department and U.S.A.I.D. do: prevent the wars that we can avoid so that we fight only the ones we must.

Many people say that this is not an easy issue, we cannot just say that this is how it is, it’s not black and white. But I say that this is black and white. Either we stop the emissions or we don’t. There are no gray areas when it comes to survival.

I hope my own children never have to fight a war.

War is what happens when language fails.

When you go to war as a boy, you have a great illusion of immortality. Other people get killed, not you… Then, when you are badly wounded the first time, you lose that illusion, and you know it can happen to you.

You cannot simultaneously prevent and prepare for war.

I personally have stopped flying. I have stopped eating meat and dairy.

A war with Pakistan would be an utter disaster.

More than an end to war, we want an end to the beginning of all wars – yes, an end to this brutal, inhuman and thoroughly impractical method of settling the differences between governments.

War settles nothing.

It is not only the living who are killed in war.

You will kill 10 of our men, and we will kill 1 of yours, and in the end it will be you who tire of it.

People are going to buy cheap fertilizer so they can grow enough crops to feed themselves, which will be increasingly difficult with climate change.

No body can be healthful without exercise, neither natural body nor politic, and certainly, to a kingdom or estate, a just and honourable war is the true exercise.

I shall proceed from the simple to the complex. But in war more than in any other subject we must begin by looking at the nature of the whole; for here more than elsewhere the part and the whole must always be thought of together.

War is the business of barbarians.

I have known war as few men now living know it. It’s very destructiveness on both friend and foe has rendered it useless as a means of settling international disputes.

We are living in the beginning of a mass extinction and our climate is breaking down.

War is not an exercise of the will directed at an inanimate matter.

We’ve got to keep our eye on what’s happening with Russia and North Korea. We cannot lose sight of domestic policy, either. Healthcare. Immigration. Climate change.

I know war as few other men now living know it, and nothing to me is more revolting. I have long advocated its complete abolition, as its very destructiveness on both friend and foe has rendered it useless as a method of settling international disputes.

I understand how every healthy child, every new road, puts a country on a better path, but instability and war will arise from time to time, and I’m not an expert on how you get out of those things.

I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.