New policies must be adopted under climate change conditions to secure sustainability of agricultural crop production. Despite the proved reliability of present climate and crop-growth modelling tools for climate risk assessments, they have been not been noticeably applied for supporting agricultural decision-making in practice. The EU proposal AGRIDEMA provided initial contacts and collaborations between "developers" and potential "users", basically researchers and experts at agricultural services. This book reviews the AGRIDEMA results. The book is designed to introduce the currently-available climate and crop-growth models, to summarise their potentialities as tools to provide reliable Climate-Change adaptation options in agriculture and to show several examples of the combined use such tools in specific climate-change agricultural risks in several countries.