A fascinating account of the lives and works of some really remarkable thinkers. Whereas US ecology was founded by racists, European ecology had a more socially aware tendency, whether you go as far back as Humboldt, or consider successors to Darwin and Marx, like Ray Lankester and William Morris, as this book does (focusing on English ecologists).
Foster has done a great job, starting 20 years ago with 'Marx's Ecology'. This latest work explores some of the loose ends left by that previous book, in wonderful detail.
I enjoy these works but have reservations as to their exact importance. The 1960s rise of political ecology in the US, including activist writers like Carson, Bookchin and Commoner, is probably more relevant to today's issues than whether or not Marx, Engels and their successors incorporated ecological thought into their critique of capitalism. But incorporate it they did, in various creative ways, so why not write that history? If nothing else it might help to give the left more confidence in adopting radical ecological policies.
If I have one particular difficulty with this book it is that it is neither a history of scientific ecology, nor of socialism, but of their interaction. This does not leave much room for examining the wider impact of this interaction on the development of either field (why was early US ecology so reactionary by comparison, for example?).