A exploration of the many ways in which green spaces can be the solution to some of our most pressing problems, from loneliness to climate change. Gardens and green spaces are at the forefront of positive change. They are modern hubs of ideas and innovation that provide solutions to some of our most persistent issues, whether it's loneliness or illness, flooding or drought. Around the world, thoughtful green advocates and pioneering horticulturists harness the power of nature to find quiet, strategic ways to tackle these problems. It's no longer just about aesthetics but about what nature can offer – conserving water, transforming mental health, bridging social divides, educating vulnerable children, redesigning polluting industries, and providing numerous reasons for hope in a rapidly changing world. Celebrating both the garden and the gardener as essential factors in a healthier future, this book presents a range of strategies to help readers reevaluate the potential within the green spaces around them, examining how these have been applied in gardens worldwide. Forty-five projects demonstrate how gardens can repair, heal, empower, nourish, and revolutionize, while an easy-to-understand color coding links each project to others in the book that address similar issues, whether it is soil health, education, or pollution. Profiles of ten Green Thinkers scattered throughout the book delve deeper into the inspiring work led by these pioneers. A glossary of plants, materials, and techniques at the back of the book encourages readers to apply the lessons they've learned in their own gardens, whether a windowsill or a one-acre plot.