1. Cycles, Feedbacks and Main Issues -- Global Cycles: Overview and Introduction -- The Nature of Land-Biosphere-Atmospheric Feedbacks in the Hydrological Cycle -- Scale Issues -- Multiple Equilibria -- 2. Systems Approach: The Nature of Coupled Models -- Introduction -- Fluxes, Compartments and Ordering of Feedbacks -- Non-Linearities -- Parameterization of Complex Hydrological Systems -- 3. S…