“The forcings that drive long-term climate change are not known with an accuracy sufficient to define future climate change.”
– James Hansen, “Climate Forcings in the Industrial Era,” Proceedings of the National Academy of Sciences, October 1998, p. 12753.
“In view of the immense power of natural weather and climate fluctuations and the great buffering capacity of the Earth, especially the ocean, it is easy to be skeptical about whether small anthropogenic changes of atmospheric composition can have important practical impacts.”
– James Hansen et al., “How Sensitive Is the World’s Climate?,” National Geographic Research & Exploration, 9(2): 1993, p. 157.
“Climate is always changing. Climate would fluctuate without any change of climate forcings. The chaotic aspect of climate is an innate characteristic of the coupled fundamental equations describing climate system dynamics.”