Water covers some 75% of the earth s surface, while land covers 25%, approximately. Yet the former accounts for less than 1% of world GDP, the latter 99% plus. Part of the reason for this imbalance is that there are more people located on land than water. But a more important explanation is that while land is privately owned, water is unowned (with the exception of a few small lakes and ponds), or governmentally owned (rivers, large lakes). This gives rise to the tragedy of the commons: when something is unowned, people have less of an incentive to care for it, preserve it, and protect it,...

This book compares and contrasts the motivations, morality, and effectiveness of space exploration when pursued by private entrepreneurs as opposed to government.