Toward Ecosophy

I haven't read it, but I suspect it's pretty good - Flowers spent some of his grad school time in Germany and got involved with various German occult groups, including one based on Guido von List's Armanen runes, which originated in the same German Romantic milieu that led to the kind of occultism the Nazis were involved with. That is to say, I suspect that in addition to more normal research, his personal experience likely gave him some good insight.

And, since this is the internet, I will state explicitly that none of the above is meant to imply that Flowers is/was a Nazi or that his personal experience was with the same occult groups/practices/people as the Nazis.