Upstream costs rose by 12pc a year from 2000 to 2012 due to rising rig rates, deeper water depths, and the costs of seismic technology. This was disguised as China burst onto the world scene and powered crude prices to record highs. Major disruptions in Libya, Iraq, and parts of Africa have since prevented oil from falling much below $100, even though other commodities have been in the doldrums. But even flat prices for three years have exposed how vulnerable the whole oil and gas edifice is becoming.