A wonderful update of a brilliant duology first published in the 1980s. The storyline is pretty much the same as the original, but the writing is tighter, the motivations for the characters are better explained, and things aren't quite as black and white as in the original.
The addition of references to an ecologically destroyed earth are fascinating. It's never made completely clear in the book exactly what has gone wrong on earth, but there is clearly a global warming environmental catastrophe of a scale which the IPCC is currently predicting. This backdrop makes complete sense of the rationale behind "Lear's Daughters" .
The Sawl culture is brilliantly drawn and the character of Ghirra is especially moving as a person confronting a huge change in his perception of the world, but at the same time making the Terrans challenge their own assumptions (e.g. on the benefits of perpetual economic growth, or population control as a benefit to society).
The Terran crew are also very well characterised, somewhat archetypal (e.g. spacer, grunt, heroine of the Left and company man) but these archetypes work well in this parable of culture vs company, environment vs economics.
And the Goddesses - well, you'll have to read the book, but I still think that the concept of weather goddesses is fantastic.
"The Wave and the Flame" and "Reign of Fire" were two books that shaped the way I thought as a teenager. Reading the updated version, Lear's Daughters, makes me grateful to Ms Kellogg that I was able to share her world as a teenager when it inspired me to study environmental science, and now more than 20 years later I still work in the environmental sector. This book has brought me full circle and reaffirmed my commitment.