In Kigali, Kenya's capital Nairobi, Zimbabwe's capital Harare, and across fourteen African countries, a quiet green revolution is taking root. A newly released book from Johannesburg City Parks and Zoo brings together 34 case studies documenting how urban trees and green spaces are becoming essential infrastructure for cities facing unprecedented heat, flooding, and rapid growth. The book, titled Urban Forests and Green Spaces in Africa: Case Studies and Lessons from Across the Continent, makes a clear argument: trees are no longer a luxury amenity for African cities but a critical response to climate change, biodiversity loss, and urban inequality.
Africa's cities are under strain. The continent's population is now nearly 1.5 billion, and it is urbanizing faster than any other region in the world—with projections suggesting that 80% of future population growth will occur in urban areas. At the same time, the Intergovernmental Panel on Climate Change's Sixth Assessment Report confirms that hot days, hot nights, and heatwaves have become more frequent across Africa, while coastal cities face rising vulnerability to floods from intense rainfall events and sea level rise. The pressure is mounting, and cities are responding.
The case studies span the breadth of the continent: restoring biodiversity around wetlands in Rwanda, creating Miyawaki forests—native forests planted densely together—in Nairobi, greening heat-stressed neighborhoods in Harare, transplanting baobabs in Senegal, and rehabilitating degraded urban land in South Africa. Kenya offers a telling example of what's possible: since 2007, the Miyawaki restoration method has helped establish mini forests across parts of Nairobi, with more than 236,000 seedlings planted between 2011 and 2020. In Addis Ababa, green corridors and tree-lined streets are becoming increasingly common following a citywide effort to restore riversides and expand public green spaces. And in Ethiopia's Amhara region, Bahir Dar has emerged as one of Africa's most heavily treed urban centers, with palm-lined trees providing near-continuous canopy cover—some main streets approaching 100% canopy closure—along major boulevards.
The benefits reach far beyond cooling streets. Trees and green spaces store carbon, reduce air pollution, improve water quality, support biodiversity, and provide mental and public health benefits that are essential to urban livability. In Niamey and Maradi, Niger, green spaces across 60 schools are helping reduce extreme heat, improve learning conditions, and provide food and income opportunities for communities. At the continental scale, the African Forest Landscape Restoration Initiative has mobilized significant funding toward restoring 100 million hectares of degraded land by 2030—an area almost twice the size of Kenya.
The 170-page volume draws on contributions from 74 authors, 80% of them African, reflecting the depth of expertise across the continent. As Thanduxolo Mendrew, managing director of JCPZ, writes in the book's foreword, "The decisions made in the next decade, about what we plant, where we plant it, who has access to green spaces, and how we protect what we have, will shape the livability of African cities for generations." The question now is not whether African cities need trees, but how to ensure that the right trees are planted in the right places, and that their long-term sustainability is secured.