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Our share of the planetary pie - PubMed

  • ️Mon Jan 01 2007

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Our share of the planetary pie

Jonathan A Foley et al. Proc Natl Acad Sci U S A. 2007.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.

Global distribution of croplands (Upper) and pastures and rangelands (Lower). Ramankutty et al. (2) provide the most detailed characterization of the world's agricultural land derived by combining statistical data for 15,990 administrative units of the world with satellite-based land cover data at 1-km resolution. Approximately 35% of the world's ice-free land surface was devoted to agriculture in 2000.

Fig. 2.
Fig. 2.

Estimated change (percentage) in natural NPP from croplands. Noteworthy are regions where mechanization, irrigation, and fertilization increase cropland productivity above natural rates, while crop NPP in other regions is less than the natural NPP. Calculated from recent analyses of crop yields (10) and ecosystem productivity (11).

Fig. 3.
Fig. 3.

Estimated fate of human-appropriated terrestrial ecosystem production. (Upper) Allocation (percentage) of crop production to food and nonfood uses. We show the percentage of crop NPP used to produce food that humans consume directly or indirectly in processed products. The majority of the nonfood portion is feed for livestock, although a lesser portion supports fiber or luxury crops, like cotton and coffee. The results are based on a recent analysis of crop yields (10). (Lower) Allocation (percentage) of global crop production to international exports. We show the percentage of crop NPP bound for international export; the remainder is for domestic consumption. The results are based on a recent analysis of global crop yields (10).

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References

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