n. One who believes that petroleum depletion will inevitably lead to a severe recession or depression, followed by a Malthusian catastrophe.
n. One who, or that which, dooms.
The Century Dictionary and Cyclopedia
n. One who dooms, as a judge or a juryman.
Word Usage
"I have been following Sharon for almost two years, not just because she is a peak oil "doomer" and permaculturist, but because she's as interested in domestic life as she is in literature and economics and the environment."