The main objective of this study is to analyze the perceived barriers and opportunities with regard to the implementation of urban agri-green roofs (UAGR) in cities. The case study was conducted in Barcelona, a Mediterranean compact city. The World Café method was used in this work. Five categories of barriers and opportunities were discussed (social, environmental, legal/administrative, technological/architectural, and economic) by interdisciplinary stakeholders.

A total of 129 barriers and opportunities were identified. The main barriers identified were as follows: the lack of information and social cohesion regarding UAGR projects; the Mediterranean climate; the lack of specific regulations and protocols; the initial investment; and the pre-condition of the roof and its load bearing capacity. The main opportunities were social cohesion; improved life quality; new specific regulations; the profits derived from UAGR projects; and aesthetic improvement.

The UAGR's scale of impact results showed a homogeneous distribution between “building” and “city”, while the “global” scale remains residual. Regarding the stage of the UAGR life cycle at which barriers and opportunities emerge, the results highlight how most opportunities appear during the “use” stage of the roof, whereas barriers do so during the “project” stage.

这项研究的主要目的是分析在城市中实施城市农业绿色屋顶（UAGR）方面的障碍和机遇。案例研究在地中海紧凑型城市巴塞罗那进行。这项工作使用了世界咖啡厅法。跨学科利益相关者讨论了五类障碍和机遇（社会，环境，法律/行政，技术/建筑和经济）。

总共确定了129个障碍和机遇。确定的主要障碍如下：关于UAGR项目缺乏信息和社会凝聚力；地中海气候；缺乏具体的法规和协议；初始投资；屋顶的前提条件及其承载能力。主要机会是社会凝聚力；改善生活质量；新的具体规定；UAGR项目产生的利润；和美学上的改善。

UAGR的影响量表显示“建筑物”和“城市”之间的分布均匀，而“全球”量表仍然是剩余的。关于UAGR生命周期中出现障碍和机会的阶段，结果突出了大多数机会在屋顶的“使用”阶段出现的方式，而障碍在“项目”阶段出现。