What if the most powerful climate solution isn’t in some distant technology — but growing right above your head?In this episode of the Lean to the Left Podcast, host Bob Gatty sits down with Joshua Harrison, co-founder and chief strategy officer of Leaf Island, to explore how green roofs and nature-based design can radically reshape the way we live in cities.With more than 80% of Americans living in urban areas, rising heat, pollution, and climate vulnerability are intensifying. But Harrison explains how integrating nature into our built environment — from rooftops to walls — can cool cities, absorb carbon, reduce energy costs, and create healthier spaces for everyone. Inside the episode:• Why green roofs are one of the most effective tools for fighting the urban heat island effect• How plants use evapotranspiration to naturally cool entire neighborhoods• The innovative way Leaf Island turns styrofoam waste into lightweight soil• What cities like Singapore, Paris, and Mexico City can teach the U.S. about urban greening• The surprising financial incentives for building owners• How green infrastructure can extend roof life, reduce emissions, and support biodiversityHarrison's message is simple and powerful: Cities don’t need to choose between modernity and nature — they can (and must) embrace both.This conversation reveals a future where green roofs are not a luxury, but a standard part of urban resilience and climate adaptation. Learn more about Leaf Islandhttps://leafisland.org Subscribe for more discussions on climate, politics & social justice.https://youtube.com/@leantotheleftCHAPTERS:00:00 Introduction to the Lean to the Left Podcast00:10 The Environmental Challenge of Urban Heat00:52 Introducing Joshua Harrison and Leaf Island01:38 The Concept and Benefits of Green Roofs03:17 Transforming Urban Spaces with Green Infrastructure08:23 Challenges and Solutions for Existing Buildings19:27 Global Examples of Green Infrastructure21:49 Incentives and Benefits for Building Owners24:08 Political and Environmental Perspectives27:59 The Center for the Study of Force Majeure30:40 Conclusion and Final Thoughts