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Proc Natl Acad Sci U S A. 2019 Dec 10;116(50):25034-25041. doi: 10.1073/pnas.1910935116. Epub 2019 Nov 21.

Assessing the sustainability of post-Green Revolution cereals in India.

Author information

1
Department of Geography and Spatial Sciences, University of Delaware, Newark, DE 19716; kfdavis@udel.edu rd2402@columbia.edu.
2
Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19716.
3
Data Science Institute, Columbia University, New York, NY 10027.
4
Indian School of Business, Hyderabad 500032, India.
5
Indian School of Business, Mohali 140306, India.
6
School of Forestry and Environmental Studies, Yale University, New Haven, CT 06511.
7
International Institute for Applied Systems Analysis, Laxenburg, A-2361 Austria.
8
School of the Environment, Washington State University, Pullman, WA 99163.
9
Indian Institute of Public Health-Delhi, Public Health Foundation of India, Gurgaon, Haryana 122002, India.
10
School of International and Public Affairs, Columbia University, New York, NY 10027.
11
Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY 10027 kfdavis@udel.edu rd2402@columbia.edu.

Abstract

Sustainable food systems aim to provide sufficient and nutritious food, while maximizing climate resilience and minimizing resource demands as well as negative environmental impacts. Historical practices, notably the Green Revolution, prioritized the single objective to maximize production over other nutritional and environmental dimensions. We quantitatively assess outcomes of alternative production decisions across multiple objectives using India's rice-dominated monsoon cereal production as an example. We perform a series of optimizations to maximize nutrient production (i.e., protein and iron), minimize greenhouse gas (GHG) emissions and resource use (i.e., water and energy), or maximize resilience to climate extremes. We find that increasing the area under coarse cereals (i.e., millets, sorghum) improves nutritional supply (on average, +1% to +5% protein and +5% to +49% iron), increases climate resilience (1% to 13% fewer calories lost during an extreme dry year), and reduces GHGs (-2% to -13%) and demand for irrigation water (-3% to -21%) and energy (-2% to -12%) while maintaining calorie production and cropped area. The extent of these benefits partly depends on the feasibility of switching cropped area from rice to coarse cereals. Based on current production practices in 2 states, supporting these cobenefits could require greater manure and draft power but similar or less labor, fertilizer, and machinery. National- and state-level strategies considering multiple objectives in decisions about cereal production can move beyond many shortcomings of the Green Revolution while reinforcing the benefits. This ability to realistically incorporate multiple dimensions into intervention planning and implementation is the crux of sustainable food production systems worldwide.

KEYWORDS:

Green Revolution; India; cereals; sustainable agriculture; tradeoffs

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