The general information Anita Ganeri provides in Desperate Deserts (and I have been reading the 2016 edition on Open Library which looks like it might have been updated), this seems to be (from what I personally have read and have also been taught regarding deserts both at school and equally so when I took a first year geography course at university) decently factually correct (but sometimes more history and culture themed than geographic or geological) and also nicely suitable for readers from about the ages of eight or nine onwards (albeit the lack of sources and no suggestions for further reading in Desperate Deserts and seemingly in all of the Horrible Geography books is definitely something I do find pretty hugely annoying and academically problematic, and that this also makes the Horrible History books not really all that useful for supplemental research), although the newer editions do list websites, which is good, but I for one want both book and online titles.
However (and yes, this is also a pretty big however), even though I like and majorly appreciate the solid facts Anita Ganeri provides in Desperate Deserts, well, aside from my issues with Ganeri not including bibliographical information (see above), I also have two further bones of textual contention which cause me to rate Desperate Deserts with only a three star rating, a rather high three stars to be sure, but not yet in any way sufficient for me to even remotely consider four stars. For one, first and foremost, I have found the humour Anita Ganeri uses in Desperate Deserts for the most part annoyingly crass, too artificial, often leaving me feeling majorly uncomfortable when this is juxtaposed with stories of desert related devastation and horror (not to mention that Ganeri's petty much constant denigrations of geography teachers and of teachers in general throughout Desperate Deserts truly does makes me rather cringe and be filled with more than a bit of anger). And for two, while Mike Phillips' black and white cartoons for Desperate Deserts are adept, personally speaking, I have found them much too silly and caricature-like for my aesthetic tastes and also too visually unorganised and occasionally even quite confusing (and that I also would definitely prefer colour illustrations and also for some both archival and current desert photographs to be included in Desperate Deserts).
So therefore, while Desperate Deserts is definitely nicely educational, I am indeed with regard to text and images a bit bah humbug and that especially what Anita Ganeri thinks is humorous and is meant to lighten Desperate Deserts for the most part just does not really work all that well for me (and actually not at all). But to be honest, for the right kind of audience and in particular for boys, the exaggerated humour and the parodistic artwork of Desperate Deserts will or should probably be a huge hit (even if this has not been the case for me, for in particular adult me but also to be honest, to be truthful here, more than somewhat for my inner child as well).