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Energy and the u.s. Economy: a biophysical perspective
Science (New York, N.Y.)
|August 31, 1984
Summary
National energy use strongly correlates with economic activity, influencing Gross National Product and productivity. Declining energy return on investment suggests future economic growth depends on net energy yield from new sources.
Area of Science:
- Energy Economics
- Biophysical Economics
- Economic History
Background:
- Standard economic models often overlook the direct relationship between energy consumption and economic performance.
- Historical analysis of national economies requires integrating energy use patterns with economic indicators.
- Understanding energy quality and its impact on efficiency is crucial for accurate economic assessment.
Purpose of the Study:
- To present hypotheses on the relationship between national energy use and economic activity.
- To analyze time-series and cross-sectional data for the U.S. economy over nearly a century.
- To introduce and assess the concept of energy return on investment (EROI) as an economic driver.
Main Methods:
- Analysis of nearly 100 years of time-series data and 3 years of cross-sectional data for 87 U.S. economic sectors.
- Correlation analysis between energy use metrics and economic indicators like Gross National Product (GNP), labor productivity, and price levels.
- Incorporation of energy quality corrections and examination of inter-sectoral fuel use shifts.
Main Results:
- Close correlations found between energy use and GNP, labor productivity, and price levels, improved by energy quality corrections.
- Apparent increases in U.S. energy efficiency are largely attributed to shifts towards higher-quality fuels (petroleum, electricity) and inter-sectoral fuel use changes.
- A significant decline in energy return on investment (EROI) for principal fuels over recent decades was observed.
Conclusions:
- Energy return on investment is a critical factor driving economic activity.
- Future economic growth is contingent on the net energy yield from alternative energy sources.
- Standard economic models may require revision to incorporate biophysical constraints on economic activity.
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