Part 1. How we might lose our satellites. Orbital debris -- Space war -- Solar storms -- Part 2. If we were to lose our satellites ... The global positioning system (military uses) -- Economic fallout -- The global positioning system and the average person -- Spy satellites and military communications -- Communications -- Weather forecasting -- Remote sensing: environmental monitoring and science -- The international space station and human space flight -- Effects on scientific research satellites -- Part 3. What can we do? Reduce the growth in orbital debris -- Reduce the amount of debris in space -- Harden against space radiation (contributed by Dr James K. Woosley) -- Appendices. More on orbital debris -- The Kessler Effect as originally described -- (Selected) spacecraft failures and anomalies due to solar and geomagnetic (solar event-induced) storms or orbital debris impacts -- International agreements governing orbital debris and space weaponization.