Journal of Development Economics · 2025 · Inés Berniell、Mariana Marchionni、Julián Pedrazzi、Mariana Viollaz
中文摘要
本文利用巴西男女候选人同场竞争的市长选举数据,探讨女性政治领导人如何影响环境结果与气候变化政策行动。我们采用断点回归设计,比较女性以微弱优势获胜的市镇与男性以微弱优势获胜的市镇,从而识别女性赢得市长选举的因果效应。我们发现,与男性市长相比,女性市长显著减少了亚马孙生物群系市镇的温室气体排放和森林砍伐。具体而言,当女性赢得选举时,亚马孙地区每个市镇的年温室气体排放量减少151万吨二氧化碳当量。仅这一效应就相当于亚马孙生物群系内所有市镇平均年排放量的23%,以及巴西全国平均排放量的6.4%。这一减排源于土地利用部门排放强度(二氧化碳当量/GDP)的下降,而市镇经济活动并未发生变化。土地利用部门排放的部分减少可归因于森林砍伐的减少。具体而言,亚马孙地区由女性领导的市镇森林砍伐有所减少:相对于基期森林覆盖面积,森林形态损失下降3个百分点,相当于比对照市镇的森林砍伐水平低32%。我们考察了女性以微弱优势战胜男性当选市长可能带来积极环境影响的潜在机制,发现在亚马孙市镇,女性当选市长在其政府施政纲领中为环境议题分配了更多篇幅,也更倾向于投资环境相关举措。当选女性与男性市长在环境法规执行力度及受教育水平上的差异,均无法解释上述结果。
Abstract
This paper explores how female political leaders impact environmental outcomes and climate change policy actions using data from mixed-gender mayoral races in Brazil. We rely on a Regression Discontinuity design that compares municipalities where women narrowly won the election with those where men narrowly won. This strategy allows us to identify the causal effect of a woman winning the mayoral election. We find that, compared to male mayors, female mayors significantly reduce greenhouse gas emissions and deforestation in the municipalities with Amazon biome. Specifically, when a woman wins the election, annual greenhouse gas emissions decrease by 1,510 thousand tons of CO2e per municipality in the Amazon. This effect alone represents 23% of the average annual emissions of all municipalities within the Amazon biome and 6.4% of Brazil's nationwide average. This reduction is driven by a reduction in emissions intensity (CO2e/GDP) in the Land Use sector, without changes in municipal economic activity. Part of the reduction in emissions in the Land Use sector is attributable to a decline in deforestation. Specifically, female-led municipalities in the Amazon experience a reduction in deforestation, with a 3 percentage-point decrease in the loss of forest formations relative to the baseline forest cover. This represents a 32% reduction compared to deforestation levels in the comparison municipalities. We examine potential mechanisms that could explain the positive environmental impact of narrowly electing a female mayor over a male counterpart and find that in Amazon municipalities, female elected mayors allocate more space to the environment in their government proposals and are more likely to invest in environmental initiatives. Differences in the enforcement of environmental regulations and the level of education of elected female and male mayors do not explain the results.