"The minority has discovered a powerful help in influencing majorities. It has been found possible so to mold the mind of the masses that they will throw their newly gained strength in the desired direction. In the present structure of society, this practice is inevitable. Whatever of social importance is done today, whether in politics, finance, manufacture, agriculture, charity, education, or other fields, must be done with the help of propaganda. Propaganda is the executive arm of the invisible government."

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One can see from space how the human race has changed the Earth. Nearly all of the available land has been cleared of forest and is now used for agriculture or urban development. The polar icecaps are shrinking and the desert areas are increasing. At night, the Earth is no longer dark, but large areas are lit up. All of this is evidence that human exploitation of the planet is reaching a critical limit. But human demands and expectations are ever-increasing. We cannot continue to pollute the atmosphere, poison the ocean and exhaust the land. There isn't any more available.

— Stephen Hawking