„We should remember that the last time global temperature was 5C different from today, the Earth was gripped by an ice age. So the risks are immense and can only be sensibly managed by reducing greenhouse gas emissions, which will require a new low-carbon industrial revolution.“

—  Nicholas Stern, "Climate change is here now and it could lead to global conflict" http://www.theguardian.com/environment/2014/feb/13/storms-floods-climate-change-upon-us-lord-stern, The Guardian (14 February 2014).
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„Those numbers ay not sound like a bid deal until one reflects that average global temperatures were "only" 5 degrees cooler at the height of the last Ice Age.“

—  Jared Diamond American scientist and author 1937
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„Mars has global warming, but without a greenhouse and without the participation of Martians. These parallel global warmings -- observed simultaneously on Mars and on Earth -- can only be a straightline consequence of the effect of the one same factor: a long-time change in solar irradiance.“

—  Khabibullo Abdusamatov Russian astrophysicist 1940
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„In the nuclear age we are all interdependent. The Earth is our only common home which we cannot abandon. The new suicidal situation calls for the new thinking.“

—  Yevgeniy Chazov Russian physician 1929
Context: Nuclear war, unless it is prevented, would lead to the extinction of life on Earth and possibly in the Universe. Can we take such a risk? In our medical practice when we deal with a critical patient in order to save him, we mobilize all our energies and knowledge, sacrifice part of our hearts and enlist the cooperation of our most experienced colleagues. Today we face a seriously ill humanity, torn apart by distrust and fear of nuclear war. To save it we must arouse the conscience of the world's peoples, cultivate hatred for nuclear weapons, repudiate egoism and chauvinism, and create favorable atmosphere of trust. In the nuclear age we are all interdependent. The Earth is our only common home which we cannot abandon. The new suicidal situation calls for the new thinking. We must convince those who take political decisions. Our professional duty is to protect life on Earth. True to the Hippocratic Oath, physicians will dedicate their knowledge, their hearts and their lives to the happiness of their patients and the well-being of the peoples of the world.

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„We are now in a new era. To label this time "the post-Cold War era" belies its uniqueness and its significance. We are now in a Global Age.“

—  Al Gore 45th Vice President of the United States 1948
Context: We are now in a new era. To label this time "the post-Cold War era" belies its uniqueness and its significance. We are now in a Global Age. Like it or not, we live in an age when our destinies and the destinies of billions of people around the globe are increasingly intertwined. When our grand domestic and international challenges are also intertwined. We should neither bemoan nor naively idealize this new reality. We should deal with it.

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