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Carefully avoided in many scientific discussions, conferences, government reports, and papers is the issue of human population. Indeed, in many conferences it is deemed to be a subject that is out of bounds. Rising numbers of people, and their desire for higher standards of living, put increasing demands on natural resources. More people are chasing a fixed or declining stock of reef resources: the area of the planet on which coral reefs can grow is limited, after all. In one sense it is really that simple. Some places have a human population doubling time of only 15 years, which reflects medical advances and its highly desirable accompaniments such as increased survival of people, especially infants. However, this means that current scientifically calculated solutions for a particular section of reef shoreline, for example, are negated when the population doubles. Thus the solution is no longer a scientific one, but has become largely a social and political one, and one of planning or zoning reefs and other resources as noted above. Human numbers are a part of the equation, and if we ignore any part of an equation then we cannot solve it.
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Charles Sheppard (Coral Reefs: A Very Short Introduction (Very Short Introductions))