In recognition of Earth Day and Arbour Day (tree planting and stewardship) that just passed in April, we feature a recent book, Elgar Companion to Social Innovation and the Sustainable Development Goals, co-edited by David Littlewood, Irene Garnelo-Gomez, Laurel Steinfield, and Giacomo Ciambotti, in which many TCR scholars contributed chapters. In the spirit of the TCR's newsletter, David and Irene reflect on the backstory of the book, how it came to be, the motivations behi