Agriculture in this century is confronted with the challenges of ensuring global food security. Diminishing land and water resources, a rapid increase in population particularly in developing countries, and onset of climate change are the key limitations towards sustainability of the agriculture sector. The situation demands that we address the problems of agriculture using a system approach. This is a comprehensive book outlining the issues being faced by the agriculture sector world-wide. The book covers diversified topics including water scarcity, food security, international research collaboration, sustainable agriculture, soil erosion, weed management, micro nutrients, biotechnology, investment in research, sustainable viticulture and desertification. The key theme of the book is achieving food security at the national and global scale. Various dimensions of food security are addressed simultaneously while analysing the effect of population, water scarcity, sustainable agriculture and desertification in detail. Case studies from Pakistan, Russia, the Philippines and Portugal are presented with national focus and their implications at the global level. Each chapter presents state-of-the-science synthesis on the subject matter and solutions to the specific problems. Chapters include contributions from vastly experienced scientists in their area of expertise. This book can be of particular interest for students, professors, researchers, farmers and policy makers who intend to have a food secure 21st century.