Peakist

If you mention this theory to a hard-core peakist like Mr. [Matthew] Simmons, you'd better be ready for an earful. "These economists are so smug," he said derisively. "All they talk about is the magic of the free market.[…]

A pure 'peakist' view questions how much longer conventional (cheaper) supplies of fossil fuels will continue.

The nuclear industray has traditionally argued that there is little danger of the world 'running out' of nuclear fuel in the near future; but there is also a peakist perspective on the uranium resource.

A New York man in his fifites noted that "capitalism requires constant *growth*^([sic]) for it to remain viable as an economic system, but that continuous growth may well no longer be possible due to peak oil," while a peakist in her early forties observed that "capitalism as we know it has grown on the back of cheap energy, particularly oil."