Also known as "technical peak".

Mariano Marzo, geologist and Spanish member of ASPO, talks about an iceberg. The part above water is the technical or logistical peak, plus geopolitics, that is the part every informed observer must acknolewdge is very real. The bigger part of the iceberg, hidden from view, is peak oil, the physical, geological peak. We know it exists, but unfortunately we can calculate (as with real icebergs) its size (ie: when and at what rate).

Ouch, that must be "acknowledge", and "unfortunately we can't calculate".

Sorry, no English mothertongue and such...