GAZETTE: You talk in some depth about a variety of different tree species in the book, and it sounds like you did a fair amount of hiking before it came out. Were you paying attention to the trees then or did you have to give yourself an education?

POWERS: I was a tree-illiterate until the age of 55. I liked them. I could appreciate them aesthetically. Now and then I could marvel at a particularly grand individual, but I could not identify a tree. I was oblivious to the difference between a sycamore and a maple or a tulip poplar and a sycamore. They were all just up there and I was down here.

That changed so dramatically in the course of the five, six years that I worked on this book. And it so hugely enriched my life, beyond what’s happened with the book. It’s made me immensely aware of what I don’t see. And it has made this task of simply being present to living things that aren’t human so much more central to my life.

GAZETTE: How important is it to you to get the science right? How much research did “The Overstory” take?

POWERS: I ended up reading more than 120 book-length studies on trees and a great deal of magazine articles and journal articles and web publications. I supposed it qualifies [as research], but it was also just sheer pleasure. It wasn’t work at all. In fact, I’ve continued to do it now, even a year after publication of the book.

How important was it to me to get the science right? I would say as important as I think it is for our culture to get the science right and to understand the science, because it’s only through that kind of rigorous, close, and controlled observation that we can have any idea at all of what our impact on these systems is and what the likely consequences for us will be.

GAZETTE: I read in your bio that you worked in Boston as a computer programmer. When was that, and what was that like?

POWERS: I went out [to Boston] in 1979 and I left in 1984, so just around four-and-a-half, five years. I lived in two different places. I initially lived right on the Somerville-Cambridge line and worked downtown, at Lewis Wharf, for a data-processing operation. And I later lived in the Fens just behind the fine art museum, the MFA, and that’s where I started my first book. In fact, my first book is partially set in that area and has to do with somebody who was in a position very much like me, working in data processing. Those years were incredibly formative to me.

I loved the city and I loved being young in a place that was so geared toward technology and toward science and toward education. And it was just an exciting place to rediscover my own possibilities to move from this one way of making a living to leaping off the cliff and deciding to try to become a writer.

All of that happened in Boston for me. So while I wasn’t there for a huge part of my life, it looms large in my psyche as a salient, significant place for me, as a kind of landmark where I really first got going.

GAZETTE: “The Overstory” is certainly raising awareness of forests for people. Are there other endangered parts of the natural world that you are setting your sights on to give a similar treatment?

POWERS: What I would hope for “The Overstory,” even more, perhaps, than an awareness of the vanishing old-growth forest, is the need for a changing consciousness on the part of people with regard to the nonhuman world. Really what the book is about is how very, very wrong we are to think that we’re autonomous, and to pursue a style of life that’s predicated on the belief in human exceptionalism.

The book really is about this idea we have to live here on this planet within the cycles of life that this planet has created. And while our technologies do give us great leverage and great ability to influence matter and time, they don’t exempt us from accountability and they don’t give us license to pretend that we’re not dependent on the nonhuman world.

This is a book about people who begin, like most of us, thinking that we have won this victory over nature, and who have that belief challenged and have to come to the realization that we can’t go on living here without trees. Trees, on the other hand, would be perfectly capable of carrying on in the absence of humans.

This Q&A has been edited for length and clarity.