I'll say up front that the author and I are good friends, so I'm not a neutral reviewer. But I was able to read the book in draft and so can offer comments earlier than readers who are just now starting the book.
This book is both a serious scholarly work and completely accessible to readers who had very little exposure to either women's history or environmental history. Despite the broad scope (all of U.S. history, from pre-Columbian Indians and early European settlement to the present), the narrative is enlivened by vivid details. For example, instead of blandly saying that women were involved in protesting nuclear plants in the 1970s, Unger gives details about the activist tactics of a group of Wisconsin women and teases out how their gender affected their activism. Each chapter tells such stories of women, some famous (Rachel Carson) and some not well known (for instance, two Chicanas who worked to oppose industrial developments near their homes in East Austin, TX). Some of the photos she found to illustrate the text are stunning.
Unger's work is nuanced, looking at all sorts of tensions and complexities. For instance, she is well aware that the ideals of refined domesticity that "protected" white women from the world outside the home did not protect enslaved African American women forced to work in the fields. Women are not always environmental heroes. Indeed, women drove the demand for luxuriant feathers to ornament their hats that nearly destroyed large populations of egrets and other birds. And women were enthusiastic consumers of the plethora of chemical cleaning products that entered the market after World War II.
Some of the topics covered will be new to readers. Others might be familiar, but not with the analysis of sex, sexuality, and gender that Unger provides. For example, we know that Rachel Carson's book Silent Spring was instrumental in the movement that led to the banning of DDT (and the saving of countless animals, including, no doubt, humans), but I didn't know the extent of the criticisms that were based on her being a woman (and an unmarried woman at that).
This book is appropriate for readers of US history generally as well as those specifically interested in environmental history, women's history, or activism.