マサチューセッツ州を除き、食品廃棄禁止は埋立廃棄物の削減に効果がなかった(New Study Reveals Food Waste Bans Ineffective in Reducing Landfill Waste, Except in Massachusetts) | テック・アイ技術情報研究所

マサチューセッツ州を除き、食品廃棄禁止は埋立廃棄物の削減に効果がなかった(New Study Reveals Food Waste Bans Ineffective in Reducing Landfill Waste, Except in Massachusetts)

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2024-09-12 カリフォルニア大学サンディエゴ校(UCSD)

マサチューセッツ州を除き、食品廃棄禁止は埋立廃棄物の削減に効果がなかった(New Study Reveals Food Waste Bans Ineffective in Reducing Landfill Waste, Except in Massachusetts)
Credit: Roman Mykhalchuk/iStock

米国で食品廃棄物禁止法を導入した5州のうち、効果があったのはマサチューセッツ州のみで、他の州では廃棄物削減効果がほとんどなかったとするカリフォルニア大学の研究が発表されました。マサチューセッツ州は7%の廃棄物削減を達成し、強力な施行、シンプルな規制、優れた堆肥化施設のネットワークが成功の要因です。研究者は、他の州もこのモデルを採用し、政策の改善が必要であると指摘しています。

<関連情報>

米国で最初に生ごみ廃棄が禁止された5つの州のうち、マサチューセッツ州だけが埋め立てごみを削減した Of the first five US states with food waste bans, Massachusetts alone has reduced landfill waste

Fiorentia Zoi Anglou, Robert Evan Sanders, and Ioannis Stamatopoulos
Science  Published:12 Sep 2024
DOI:https://doi.org/10.1126/science.adn4216

Editor’s summary

Food waste produces about half of the greenhouse gas emissions from the global food system, including methane emissions from food waste deposited in landfills. To reduce emissions, some governments have banned food waste disposal in landfills. Anglou et al. evaluated the effectiveness of bans that applied to commercial waste producers in five US states. They found that such policies can succeed, but this has not been the norm. The states with bans showed almost no change in organic waste disposal into landfills compared with controls derived from states without bans. The exception to this was the state of Massachusetts. Simplicity of regulation, sufficient infrastructure, low cost of compliance, and/or strong enforcement may have contributed to Massachusetts’ success. —Bianca Lopez

Abstract

Diverting food waste from landfills is crucial to reduce emissions and meet Paris Agreement targets. Between 2014 and 2024, nine US states banned commercial waste generators—such as grocery chains—from landfilling food waste, expecting a 10 to 15% waste reduction. However, no evaluation of these bans exists. We compile a comprehensive waste dataset covering 36 US states between 1996 and 2019 to evaluate the first five implemented state-level bans. Contrary to policy-makers’ expectations, we can reject aggregate waste reductions higher than 3.2%, and we cannot reject a zero-null aggregate effect. Moreover, we cannot reject a zero-null effect for any other state except Massachusetts, which gradually achieved a 13.2% reduction. Our findings reveal the need to reassess food waste bans using Massachusetts as a benchmark for success.

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