Gregor Macdonald submits: The ongoing controversy which surrounds the shale natural gas story is a nice example of entangled theories and beliefs. And, how thoughtful observers can be right on different aspects of a complex phenomenon, while arguing against each other vociferously all the while. At issue? Whether the tremendous upward swing in US natural gas production is sustainable. Sustainable on both a nominal basis, and, sustainable on a real basis. While this depends on one’s timeline, let’s first acknowledge that many who envisioned ten years ago a decline in US natural gas production–and with some justification–were wrong. At issue now, however, are the steep decline rates observed from shale natural gas wells. Don’t these decline curves imply, axiomatically, that the new miracle of shale natural gas production is doomed? First, let’s look at 37 years of monthly US natural gas marketed production , in MMcf (million cubic feet). This data is from the start of 1973 (the available start year from EIA), and is current through June, 2010:

Looked at in isolation, “steep decline” always sounds bad. How can US NG production be meaningfully boosted by new shale gas resources, if those individual wells shoot off like bottle rockets only to decline very steeply? In a back and forth conversation over this issue with Paul Kedrosky, he offered up the following remark:
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