I added a description at line 73 – 74.
line 73 - the point is made that current RNA World theories do not seem compatible with a hydrothermal origin of life. But it is not clear where this leads us. Maybe life did not begin with RNA. Maybe life did not begin with hydrothermal vents. Maybe there is some slightly different environment that we would still call hydrothermal in which RNA is sufficiently stable. Maybe there is some slightly different nucleic acid-like polymer that is stable in hydrothermal conditions. Too many unknowns here to be a useful point.