Based on the valuable criticism Section 2 has been extensively revised. Terminology has been clarified. This Section has a rather restricted purpose. It provides chemical arguments for the proposition that the pioneer organisms could only exist at high temperature and that the subsequent forms of life remained hyperthermophilic for a long time until much later an irreversible evolution generated organisms that required lower and lower temperatures. This conclusion places severe constraints on all aspects of the evolution of the genetic machinery. The fascinating topics of thermodynamics, energy dissipation and information are outside the scope of the paper.
Section 2: Thermal course of evolution (Page 6): Why a focus on thermal energy? The framework should be on thermodynamics, energy dissipation and information, all of which are linked. What is thermally upward or downward adaptation? Is it conquering niches on Earth or a process involving molecular makeup? Vocabulary and definitions are murky, especially related to the links of environmental thermal fluctuations, energy of folding and stability of polymers. Subsection (1) must be rewritten to help the reader understand the ideas. Should all adaptations comply with maximizing energy R5 dissipation? How can this be reconciled with upward and downward trends? No references are provided despite the rich literature underscoring the controversial link between physics, information theory and biology. If the focus is conquering planetary niches, then perhaps reference the contrasting views and some of their proponents (deep sea versus surface; thermophilic versus mesophilic, etc.). Further elaboration of the Wolfenden theorem appears relevant and its connections to what is known about the origin and evolution of metabolism also of importance.