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29 November 2012
Living in the Appalachian Forest, by Chris Bolgiano
Last week, I finished reading Living in the Appalachian Forest: True Tales of Sustainable Forestry, by Chris Bolgiano. It’s a grab-bag of stories from the forested mountains of the south-central Appalachians, ranging from Pennsylvania down to Kentucky and maybe Georgia, too. West Virginia and Virginia get the most attention. The driving question behind the book is: How should I manage my land? Since this is a key question in my …
4 October 2012
The Omnivore’s Dilemma, by Michael Pollan
In the delivery room last week, while we waited for Lily’s labor to ramp up, I finished reading The Omnivore’s Dilemma, by Michael Pollan. I think it was one of the most insightful, important books I’ve ever read. I was pre-disposed to like it, because I really enjoyed Pollan’s earlier book The Botany of Desire, which served as four botanico-cultural “micro-histories” in one book (one on apples, one on marijuana, …
22 April 2012
Time, Mind, Earth, Junior
Once again, we roll around to another Earth Day. I find myself in a more-contemplative-than-normal mood this year, and I’d like to take this opportunity to share a bit about what I’ve been thinking. This is a post about the personal side of geoscience – taking data, and its logical implications, and smashing it into life, and seeing what comes out the other side. Two years ago (to the day!), …
31 October 2011
7 billion people
The root of every issue that we collectively term “environmental problems” is human overpopulation. It wouldn’t matter if everyone on Earth drove a Hummer and used incandescent light bulbs and dumped raw sewage in their local watershed — if there were only fifteen people on the Earth. But the reverse is also true: if everyone lives a low-impact lifestyle, it still has an enormous aggregate effect on the planet – …
12 January 2011
Experimental vs. historical science, and environmentalism
A diagram on “how science works” betrays an “experimentalist” bias. This sets Callan off on a rumination on the much-maligned validity of historical science, and that leads to a discussion of the Big Experiment, which is humanity’s influence on the Earth system.
5 January 2011
Dirt: the Erosion of Civilizations, by David Montgomery
The final book I read over the break was Dirt: the Erosion of Civilizations, by David Montgomery. Montgomery got a MacArthur “Genius” Award for his soil work, and I use an article he wrote for GSA Today (2007) as one of the assigned readings for my Environmental Geology course. In Dirt, he lays out the case for protecting civilization by protecting soils. Attention is given to soil-forming processes, and rates …
Dirt: the Erosion of Civilizations, by David Montgomery
The final book I read over the break was Dirt: the Erosion of Civilizations, by David Montgomery. Montgomery got a MacArthur “Genius” Award for his soil work, and I use an article he wrote for GSA Today (2007) as one of the assigned readings for my Environmental Geology course. In Dirt, he lays out the case for protecting civilization by protecting soils. Attention is given to soil-forming processes, and rates …
7 May 2010
"Climate Change and the Integrity of Science"
The following letter, signed by 255 members of the National Academy of Science, appears in the current issue of the journal Science. I wholeheartedly concur with the content of this letter, and republish it here in the interest of getting its message out to the world. Please take the next four minutes of your life to read it. As a responsible citizen of the planet Earth, I encourage you to …
22 April 2010
Earth Day
… So, today is: … and not only that, it’s the 40th anniversary of the first “Earth Day.” Shall we reflect? Yes, let’s shall. My career as a geoscientist was largely inspired by desire to spend time outside, and that in turn was inspired by a lot of positive outdoor experiences as a child and young man. I feel at peace and satisfied when I am spending time in natural …

Callan Bentley is an assistant professor of geology at Northern Virginia Community College in Annandale, Virginia. He is particularly interested in structural geology and the evolution of the Appalachian mountain belt. Callan draws cartoons and writes for EARTH magazine. He lives in the Fort Valley of Virginia.









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