This book offers a wide selection of contributions presented at the LV Conference of Italian society of agricultural economics (SIDEA) Studies. Agricultural economists and sociologists reflect on the change processes that are affecting the agri-food systems and take a small step towards an improved understanding of the complexity of green metamorphosis, and the interplay between agriculture, food and ecology. The key message is that a green metamorphosis has been taking place, increasingly involving more and more aspects and dimensions: from environment to consumers' preferences, from social value to human health, from profitability to governance issues. Furthermore, this book tries to shed a light on the complexity of the new agricultural paradigm, which involves technology as well as traditions, trying to understand the ongoing metamorphosis taking into account that 'nothing is created, nothing is destroyed, everything is transformed'. This volume intends to guide the new generations of agricultural economists, who have the hard task of leading the green metamorphosis across the four main axes of sustainability: economic, socio-cultural, environmental, and political.