Further Thoughts on Our Resources by George Crispin: "His book sets forth some truly wild and far out theories. First, it proposes that Earth supports a subterranean organic domain of natural gas and petroleum that is larger than the biosphere that we occupy on the surface, then it suggests that this domain is full of heat loving bacteria that live on the natural gas and petroleum. And thirdly and most importantly for us it puts forth the idea the idea that most hydrocarbons on Earth are not 'fossil fuels' but part of the primordial 'stuff' from which Earth itself was formed some 4.5 billion years ago. The Deep Hot Biosphere may seem far out and hard to accept when first read, but a growing body of evidence based on the indisputable stature and seriousness of Thomas Gold as a scientist supports its theories. In this book he comes across as a brilliant and boldly original thinker, increasingly a rarity in modern science, as he develops revolutionary conclusions about the fundamental workings of our planet, the origins of life on Earth, the nature of earthquakes, and even the likelihood of life on other planets."

(Via Lew Rockwell.)