The food-water-energy nexus and green roofs in Sao Jose dos Campos, Brazil, and Johannesburg, South Africa

IF 9.1 Q1 ENVIRONMENTAL STUDIES
Fanxin Meng, Qiuling Yuan, Rodrigo A. Bellezoni, Jose A. Puppim de Oliveira, Yuanchao Hu, Rui Jing, Gengyuan Liu, Zhifeng Yang, Karen C. Seto
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引用次数: 2

Abstract

Green roofs affect the urban food-water-energy nexus and have the potential to contribute to sustainability. Here we developed a generalizable methodology and framework for data-sparse cities to analyze the food-water-energy nexus of green roofs. Our framework integrates the environmental costs and benefits of green roofs with food-water-energy systems and makes it possible to trace energy-water-carbon footprints across city boundaries. Testing the framework in São José dos Campos (SJC), Brazil and Johannesburg, South Africa, we found that green roofs are essentially carbon neutral and net energy consumers from a life cycle perspective. SJC is a net water beneficiary while Johannesburg is a net water consumer. Rainwater utilization could save irrigated water, but requires 1.2 times more energy consumption. Our results show that SJC and Johannesburg could direct their green roof development from local food production and energy saving, respectively and highlight opportunities for green roof practices in cities.

Abstract Image

巴西圣若泽多斯坎波斯和南非约翰内斯堡的食物-水-能源关系和绿色屋顶
屋顶绿化影响着城市的食物-水-能源关系,具有促进可持续发展的潜力。在此,我们为数据稀缺的城市开发了一种可推广的方法和框架,用于分析屋顶绿化的食物-水-能源关系。我们的框架将屋顶绿化的环境成本和效益与食物-水-能源系统结合在一起,从而可以跨越城市边界追踪能源-水-碳足迹。我们在巴西圣若泽多斯坎波斯(SJC)和南非约翰内斯堡对该框架进行了测试,发现从生命周期的角度来看,屋顶绿化基本上是碳中和的,是净能源消耗者。圣塞多斯坎普斯是净水受益者,而约翰内斯堡则是净水消费者。雨水利用可以节省灌溉用水,但所需能源消耗却高出 1.2 倍。我们的研究结果表明,上海圣荷西和约翰内斯堡可以分别从当地粮食生产和能源节约的角度来发展屋顶绿化,并强调了城市屋顶绿化实践的机遇。
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