At the time the traditional observers of the topic were mostly retired geologists from the oil industry and academia following in the footsteps of M King Hubbert (such as Jean Laherrerre, Walter Youngquist and Ali Samsam Bakhtiari as well as Campbell and Deffeyes), along with some writers such as Richard Heinberg and a vibrant (albeit wildly pessimistic) online community of neo-malthusians hanging