Newly developing countries are beginning to industrialise, primarily in Africa, with high to very high population growth rates, and characterised by a predominantly young age profile.
Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies.
This trend, which we believe is still in its infancy, effectively began with retailers and travel providers such as airlines and hotels and will no doubt go further.
At the same time, airports have been developing and expanding the range of services that they provide specifically for the business traveller in the terminal.
It was only with the growth of paediatrics and psychology in the twentieth century that studies could be carried out on a more objective, if still not always very scientific, basis.