We work very closely with the United States Geological Survey, the USGS, and we think their methodology for assessing world resources is a reasonable one, and we rely on that for our modeling. &amp;gt;&amp;gt; Channel Four news has been told by a top Saudi oil insider that the American government's forecast for future supplies is a dangerous overestimate. &amp;gt;&amp;gt; On a rare interview, the man that's just retired as head of exploration at Aramco, that's the Saudi's state oil giant, he's told us the estimates from the U.S. Government energy think tank, that's the ElA, they're simply too high, here he is. 