TONY JONES: Now to tonight's interview with Richard Heinberg. He's one of the world's leading experts on the phenomenon of peak oil. That's the point at which the world's oil reserves go into decline. The idea is that having reached its peak it's all downhill from there and there's evidence that global rates of oil discovery have been declining since the 1960s, and that new oilfields are becoming more and more inaccessible.
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