“The Gaia hypothesis is for those who like to walk or simply stand and stare, to wonder about the Earth and the life it bears.”

“Humans on Earth behave in some ways like a pathogenic micro-organism, or like the cells of a tumor.”

— James Lovelock, Gaia: The Practical Science of Planetary Medicine (2000)

“I’d look for life on Mars in the composition of its atmosphere, not by crawling around looking for …”

— James Lovelock, NASA Mars life-detection research, early 1960s

“Whenever philosophers and scientists have tried to explain how life evolved, they have made the same …”

— James Lovelock, The Ages of Gaia (1988)

“We have given Gaia a fever and soon her condition will worsen to a state like a coma. She has been …”

— James Lovelock, The Revenge of Gaia (2006); originally from an op-ed in The Independent, 2006

“A temperature rise of more than two degrees C risks altering the Earth system irreversibly.”

— James Lovelock, The Vanishing Face of Gaia (2009)

“Gaia is a very simple idea: that the Earth works as a single, complex, self-regulating system.”

— James Lovelock, The Ages of Gaia (1988)