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ensure accuracy. value of a Pennsylvania corn and soybean farm
as $75 per acre per year, but that the value drops to only $2
per acre per year when calculated by natural resource accounting
methods. Finally, Repetto et al. demonstrate that estimates of
industrial productivity growth can be spuriously low if they do
not account for emissions reductions. Using natural resource
accounting methods, they estimate productivity growth in the
electric power industry to be two to three times as high as
conventional estimates of productivity growth during the same
period. National Materials Use and Waste Production Ayres and
Ayres (this volume) and Wernick and Ausubel (this volume) focus
on aggregate waste generation by the U.S. economy. Ayres and
Ayres make detailed calculations to estimate this aggregate
waste production. They use a mass