"Change is the only constant."
- Heraclitus

"If one is sufficiently lavish with time, everything possible happens."
- Herodotus

"With their four-dimensional minds, and in their interdisciplinary ultraverbal way, geologists can wiggle out of almost anything."
- John McPhee

"We learn geology the morning after the earthquake."
- Ralph Waldo Emerson

"...And yet it does move."
- Galileo (referring to the Earth)

"I am convinced that, at its best, science is simple -- that the simplest arrangement of facts that sets forth the truth best deserves the title of science. So the geology I plead for is that which states facts in plain words -- in language understood by the many rather than by the few."
- George Otis Smith

"Human beings are now carrying out a large scale geophysical experiment of a kind that could not have happened in the past nor be reproduced in the future. Within a few centuries, we are returning to the atmosphere and oceans the concentrated organic carbon stored in sedimentary rocks over hundreds of millions of years."
- Roger Revelle and Hans Suess, 1957

"We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology."
- Carl Sagan

"If the quantity of carbonic acid (CO2) increases in geometric progression, the augmentation of the temperature will increase nearly in arithmetic progression."
- Svante Arrhenius, 1896

"To uphold a tenet that contradicts reason is to undermine one's credibility. To contradict empirical evidence is a still greater fallacy."
- The Dalai Lama