Book excerpt: Food gardening is becoming increasingly popular, as people look for new ways to live more sustainably and minimize harm to the environment. This book addresses the 21st century trends which bring new challenges to food gardening - anthropogenic climate change, environmental degradation, natural resource scarcity, and social inequity - and explains the basic biological, ecological and social concepts needed to understand and respond to them. Examples throughout the text demonstrate how to successfully use these concepts, while supporting gardeners' values, and their goals for themselves, their communities and the world.