Holt Environmental Science Online textbook

Well, I see some new pictures on the cover and some new maps in the appendix, but there is little else to distinguish the 2000 version of Holt Environmental Science from the 1996 version. The 2000 version is essentially a reprint of the 1996 version, with a new date displayed on the copyright page.

The copyright page is really the most noteworthy page in the 2000 version, for this reason: It shows the date "2000, " with no indication that any earlier version of Holt Environmental Science has ever existed. Holt clearly wants us to believe that this is a brand-new book. It isn't.

When I wrote my review of the 1996 version for The Textbook Letter , I began by stating my assessment of the book as a whole:

Holt Environmental Science is directed, I believe, at high-school students who have had no previous exposure to science. It appears to be most suitable for students who are not interested in science and who, if they had their choice, would not look at science books at all. It isn't appropriate for students who really want to study science, and it isn't suitable for use in college-prep courses.

That appraisal applies, of course, to the 2000 version as well, and so does everything else that I said about the 1996 book. Let me summarize some of the other observations that I recounted in my review of the 1996:

• The pages of Holt Environmental Science are lavish, confusing visual displays, loaded up with images, headings, boxes, logotypes, blurbs and other distractions, and the main text is obscured by a barrage of sidebars, feature articles, section reviews, "Eco-Fact" notes, "Field Activity" notes and other items. Trying to find and follow the main text is a head-spinning challenge.
• Because the pages are so heavily decorated with pictures, sidebars and other ornaments, the presentation of scientific topics seldom achieves any depth. Most matters are handled superficially, and some of the material smacks of alarmism.
• Each chapter has an "Investigation" activity that requires students to make field observations or to perform experiments that expand on information presented in the chapter. Many of these "Investigations" involve simple, often clever illustrations of scientific or technological ideas.
• The book offers instructions for various projects, such as making a compost heap, planting a wildlife garden, or constructing a bat house. These are reminiscent of a child's fun-with-nature guide rather than a science text - but they are entertaining, they are instructive in their own simple way, and they seem suitable for slow students.
• The book ostensibly presents different points of view about solutions to environmental problems, but the presentations are not always even-handed. A liberal, activist predilection seems to prevail.
• Although Holt Environmental Science does not provide instruction in hard- core science, it is generally effective in demonstrating scientific methods, and it can help poorly prepared students to see that science is enjoyable. Students whose motivations and capacities are limited will love this book, with its flashy style and its emphasis on matters that are relevant to daily life, and some students may even be inspired to try a real science course or two.

Checking for Changes

In producing the 2000 version, Holt has embellished the book's cover with some new pictures and with a diagonal stripe of advertising. The advertising says: "Includes SCILINKS NSTA Internet Resources and CNN Science in the News Video Resources." I'll tell you later about what I found when I went looking for those "resources."

Inside the book, there are only two substantial changes. The appendix has sixteen new pages of maps plus a new page about "Economics and the Environment"; and the lists of "STAFF CREDITS" and "ACKNOWLEDGMENTS, " at the front of the book, have been expanded. (Apparently, the task of reprinting the 1996 book required more people than had toiled to produce the 1996 book in the first place.)

Those changes are the big ones. The 2000 version also shows a number of lesser modifications that I find enigmatic. On page xiv, for example, a picture of an iguana has been interchanged with a picture of some soft-drink cans: In the 1996 book, the iguana appeared on the right-hand side of the page, and the cans were on the left - but now the iguana is on the left, and the cans are on the right. (Please don't ask me why.) Other trivial, cryptic alterations occur throughout the book. Some color schemes have been altered, logos have been tweaked, and the map that spans pages 406 and 407 (in the appendix) has new colors as well as a new key.

How about changes in content? Even though the 1996 book contained plenty of erroneous material and silliness, the Holt editors have not made any major corrections. In a few places, they have revised defective passages by making tiny alterations that did not require any extensive resetting of type. I have noticed seven such cases. In three of them, the alterations have helped. In the four other cases, the alterations have been inconsequential, and the revised material is no better than the 1996 material was.

The article "Making a Difference: High School Chemist" (pages 148 and 149) has not been changed at all - and as a result, it is now even sillier than it was when it appeared in the 1996 book. The subject of the article is a girl called Elizabeth Philip. When we met Elizabeth in 1996, she allegedly had done "research" and had discovered that she could remove "toxic trace metals" from tap water - in an "ecologically safe and affordable" way - by treating the water with living yeast cells. In my review of the 1996 book, I noted that the article did not cite any data to show that any metal concentrations really declined when water was percolated through a mass of yeast cells, nor did it offer support for the claim that Elizabeth's technique depended on the cells' being alive. There was nothing to suggest that Elizabeth's "research" had involved any real science. Holt's account of Elizabeth's project was vague and unsatisfactory, but Holt has now reprinted it, word-for-word, in the 2000 book - and when I say "word-for-word, " I mean it. In the 1996 book, the article began with this sentence: "Elizabeth Philip has received a long list of prestigious awards for her scientific work - at the age of only 17!" In the 2000 book, the article again begins with: "Elizabeth Philip has received a long list of prestigious awards for her scientific work - at the age of only 17!" According to Holt, Elizabeth has been 17 years old for five years!

Another example of recurrent silliness comes on page 146, where Holt has reprinted a laboratory exercise headlined "How Safe is Our Groundwater?" Let me say again that the headline doesn't seem to have any function except to suggest some kind of threat: The exercise does not present any information about natural groundwater, and it does not describe any mechanism for assessing how "safe" any groundwater supply may be.