David Grinspoon Quote
The carbon cycle has grabbed the headlines, but we’ve also seized hold of many other major geochemical cycles. Through production of fertilizers, we’ve radically altered Earth’s nitrogen cycle. The sulfur cycle has become dominated by industrial emissions. We’ve dammed rivers so thoroughly that there is now more than five times as much fresh water captured in reservoirs as there is remaining in all the wild rivers and streams of Earth! That is not a minor change. It’s fair to say that we’ve domesticated a major part of the water cycle of this planet. Earth’s vibrant hydrosphere, arguably our planet’s most distinctive feature, has to some degree become an artifact of human civilization. Every year now, humans constructing roads, buildings, and farms displace ten times more dirt than the combined erosive forces of wind, rain, earthquakes, and tides. Simply measured by the amount of stuff we move around, we have become the undisputed world heavyweight champions
The carbon cycle has grabbed the headlines, but we’ve also seized hold of many other major geochemical cycles. Through production of fertilizers, we’ve radically altered Earth’s nitrogen cycle. The sulfur cycle has become dominated by industrial emissions. We’ve dammed rivers so thoroughly that there is now more than five times as much fresh water captured in reservoirs as there is remaining in all the wild rivers and streams of Earth! That is not a minor change. It’s fair to say that we’ve domesticated a major part of the water cycle of this planet. Earth’s vibrant hydrosphere, arguably our planet’s most distinctive feature, has to some degree become an artifact of human civilization. Every year now, humans constructing roads, buildings, and farms displace ten times more dirt than the combined erosive forces of wind, rain, earthquakes, and tides. Simply measured by the amount of stuff we move around, we have become the undisputed world heavyweight champions
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About David Grinspoon
His research focuses on comparative planetology, with a focus on climate evolution on Earth-like planets and implications for habitability. He has also studied, written and lectured on the human influence on Earth, as seen in cosmic perspective.
He has published four books, Venus Revealed, which was a finalist for the Los Angeles Times book prize, Lonely Planets: The Natural Philosophy of Alien Life, which won the 2004 PEN literary award for nonfiction, Earth in Human Hands, which was named one of NPR's Science Friday "Best Science Books of 2016" and Chasing New Horizons: Inside the Epic First Mission to Pluto, co-authored with Alan Stern. He is adjunct professor of Astrophysical and Planetary Science at the University of Colorado, a former Fellow of the Institute for Cross-Disciplinary Engagement at Dartmouth College and a former Distinguished Visiting Scholar in the College of the Environment at Wesleyan University.