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72.EPA, 2012.
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73.Gerber et al., 2013.
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74.Olson-Sawyer, 2013.
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75.Burbach and Flynn, 1980; Moody, 1988; Rachleff, 1993.
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1703334099
76.Bello, 2009, 39–53.
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77.Robinson, 2013.
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78.Giles, 2017.
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79.Patel et al., 2014.
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80.Araghi, 2013.
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81.Herrero et al., 2017.
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82.IPCC, 2007, 36; 2014.
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83.Moore, 2015, 252.
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84.Fuglie, MacDonald and Ball, 2007; Matuschke, Mishra and Qaim, 2007.
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85.Gurian-Sherman, 2009.
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86.Lobell and Field, 2007.
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87.Peng et al., 2004; Cerri et al., 2007; Kucharik and Serbin 2008; Lobell, Schlenker and Costa-Roberts, 2011; National Research Council, 2011; Challinor et al., 2014; Shindell,2016.
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88.Braconier, Nicoletti and Westmore, 2014.
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6. 廉价的能源
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0.题记：Columbus, 2003, 161.
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1.Bowman et al., 2009.
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2.Berna et al., 2012.
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3.Herodotus, 1945, 311, referenced in Heizer, 1963, 188.
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4.Mcglone and Wilmshurst, 1999.
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5.Teng, 1927.
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6.人类继续按可持续的原则利用着森林资源。当人类社会有足够的自治能力和有一个帮助人类能够从偶发的灾难中恢复过来的基地时，他们可以一起成功地管理共有资源（Thirsk, 1964)。例如，21世纪开采森林资源的平民能够比企业和国家政府更好地管理森资源（Chhatre and Agrawal, 2009）。
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