Some Russian scientists and a couple of dead American ones claim these are the sources of oil & natural gas and not reprocessed plankton etc from ancient oceans. The cool thing about this idea if true, is oil & natural gas are then renewable resources since these things exist deep in the earth’s crust at a high temperature and pressure and aren’t going away. It doesn't matter if oil and gas are continuing to be created, if we are using them up at a much higher rate than they are being made.