This book opens a new approach to the study of global environmental changes having unfavourable character for mankind and other living systems. The main advantage of the book consists in the accumulation of knowledge from different sciences to parametrize the global ecodynamic process. Natural catastrophes are considered as an interactive element of global natural dynamics which are described by means of simulation models of global nature/society. The realization of this approach allows the integration within a complex structure of all international and national means of environmental monitoring and provides a tool for objective evaluation of the environmental quality. The main purpose of this book is to develop a universal information technology to estimate the state of environmental subsystems functioning under various climatic and anthropogenic conditions.