Comment
doi: 10.1073/pnas.0705190104. Epub 2007 Jul 23.Our share of the planetary pie
Affiliations
- PMID:17646656
- PMCID: PMC1937509
- DOI: 10.1073/pnas.0705190104
Item in Clipboard
Comment
Our share of the planetary pie
Jonathan A Foley et al. Proc Natl Acad Sci U S A..
Display options
Format
Display options
Format
No abstract available
Conflict of interest statement
The authors declare no conflict of interest.
Figures
Global distribution of croplands (Upper) and pastures and rangelands (Lower). Ramankuttyet 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.
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).
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).
Comment on
- Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems.Haberl H, Erb KH, Krausmann F, Gaube V, Bondeau A, Plutzar C, Gingrich S, Lucht W, Fischer-Kowalski M.Haberl H, et al.Proc Natl Acad Sci U S A. 2007 Jul 31;104(31):12942-7. doi: 10.1073/pnas.0704243104. Epub 2007 Jul 6.Proc Natl Acad Sci U S A. 2007.PMID:17616580Free PMC article.
References
- Ramankutty N, Evan AT, Monfreda C, Foley JA. Glob Biogeochem Cy. 2007 in press.
- Matson PA, Parton WJ, Power AG, Swift MJ. Science. 1997;277:504–509. - PubMed
- Tilman D, Fargione J, Wolff B, D'Antonio C, Dobson A, Howarth R, Schindler D, Schlesinger WH, Simberloff D, Swackhamer D. Science. 2001;292:281–284. - PubMed
- Rosegrant MW, Cai X, Cline SA. World Water and Food to 2025. Washington, DC: Int Food Pol Res Inst; 2002.
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources