Global patterns in human consumption of net primary production

  title={Global patterns in human consumption of net primary production},
  author={Marc L. Imhoff and Lahouari Bounoua and Taylor H. Ricketts and Colby J. Loucks and Robert Harriss and William T. Lawrence},
The human population and its consumption profoundly affect the Earth's ecosystems. A particularly compelling measure of humanity's cumulative impact is the fraction of the planet's net primary production that we appropriate for our own use. Net primary production—the net amount of solar energy converted to plant organic matter through photosynthesis—can be measured in units of elemental carbon and represents the primary food energy source for the world's ecosystems. Human appropriation of net… 
Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems
A comprehensive assessment of global HANPP based on vegetation modeling, agricultural and forestry statistics, and geographical information systems data on land use, land cover, and soil degradation that localizes human impact on ecosystems suggests large-scale schemes to substitute biomass for fossil fuels should be viewed cautiously.
Global human appropriation of net primary production doubled in the 20th century
It is found that although human population has grown fourfold and economic output 17-fold, global HANPP has only doubled, and this result calls for caution in refocusing the energy economy on land-based resources and for strategies that foster the continuation of increases in land-use efficiency without excessively increasing ecological costs of intensification.
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Human Appropriation of Net Primary Production, Stocks and Flows of Carbon, and Biodiversity
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Human appropriation of net primary production (HANPP) is a substantial improvement upon 20th century attempts at developing an ecological footprint indicator because of its measurability in relation
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Human Appropriation of Net Primary Production
The fraction of total plant growth or net primary production (NPP) appropriated by humans, often referred to as human appropriation of net primary production (HANPP), is among the most widely used
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Human alteration of Earth is substantial and growing. Between one-third and one-half of the land surface has been transformed by human action; the carbon dioxide concentration in the atmosphere has
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The effects of increasing carbon dioxide (CO2) and climate on net carbon storage in terrestrial ecosystems of the conterminous United States for the period 1895-1993 were modeled with new, detailed historical climate information, suggesting that processes such as regrowth on abandoned agricultural land or in forests harvested before 1980 have effects as large as or larger than the direct effects of CO2 and climate.
Human Appropriation of Photosynthesis Products
It is estimated that humans appropriate 10 to 55% of terrestrial photosynthesis products, a broad range that reflects uncertainty in key parameters and makes it difficult to ascertain whether the authors are approaching crisis levels in their use of the planet's resources.
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It is indicated that human demand may well have exceeded the biosphere's regenerative capacity since the 1980s and humanity's load corresponded to 70% of the capacity of the global biosphere in 1961, and grew to 120% in 1999.
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The importance of using 'reference' sites to assess the true richness and composition of species assemblages, to measure ecologically significant ratios between unrelated taxa, toMeasure taxon/sub-taxon (hierarchical) ratios, and to 'calibrate' standardized sampling methods is discussed.