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Modelling diet choices

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Abstract

Meat is an important source of greenhouse-gas emissions, but not enough people are giving it up. A new model integrates diets, land use and climate change to explore the potential and implications of mass adoption of vegetarian diets.

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... Existing mitigation assessment frameworks, such as those used by IPCC, are limited in feasibility consideration since they lack such behavioural aspects of consumer response [66]. However, it is of crucial importance to include behavioural considerations in mitigation scenarios by bridging across disciplines in order to guide decision-making for a sustainable and healthy future [67,68]. There are a few initial studies that incorporate behavioural factors into modelbased integrated assessments of feasible mitigation potential [69][70][71], yet such quantitative analyses are bounded by data availability on a global scale. ...
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The Business of Society Blog
  • J Bauer
Bauer, J. The Business of Society Blog (25 June 2018); https://go.nature.com/2XGUpVZ
Less Beef, Less Carbon (Natural Resources Defense Council
  • S Bergen
Bergen, S. Less Beef, Less Carbon (Natural Resources Defense Council, 2017); https://go.nature.com/2xFDFin
  • D Gelles
Gelles, D. The New York Times BU 3 (20 July 2018); https://go.nature.com/2XK8ux0
  • E Stehfest
Stehfest, E. et al. Clim. Change 95, 83-102 (2009).
  • F Creutzig
Creutzig, F. et al. Nat. Clim. Change 8, 260-263 (2018).
  • T Dietz
  • G T Gardner
  • J Gilligan
  • P C Stern
  • M P Vandenbergh
Dietz, T., Gardner, G. T., Gilligan, J., Stern, P. C. & Vandenbergh, M. P. Proc. Natl Acad. Sci. USA 106, 18452-18456 (2009).
  • B Beckage
Beckage, B. et al. Nat. Clim. Change 8, 79-84 (2018).
  • J M Gilligan
  • Nat
Gilligan, J. M. Nat. Clim. Change 8, 14-15 (2018).