In this volume, Clem Tisdell considers combined economic and ecological influences on levels of agricultural and marine production, their variations and sustainability. The book consists mainly of previously published articles, but also includes new chapters written especially for this collection. The book begins with an overview of the field, followed by an examination of the choice of variety of species for variable environments, new crops and diversification, production and impacts of economic and ecological factors on agricultural production generally. It goes on to consider specific aspects of pest and disease control in agriculture. The final part is devoted to bio-economic aspects of marine production. Interesting and often controversial topics include consequences and economic causes of genetic selection in agriculture, transgenic crops (GMOs), and effects of aquaculture on levels of wild fish stocks.