Discouraging of air traffic, for example, by imposing higher taxes on aeroplane fuel.
250 million travellers use international scheduled services a year -- equivalent to one in every five of the world's population. In 1994 it was estimated that the income elasticity of air traffic in West European countries is 2.4, which means that a 1% increase in income leads to an increase of 2.4% in air traffic. As a consequence, air traffic is currently growing at an annual rate of 5% and is expected to double every 14 years. Much of this is in the tourism sector which is offering cheap air travel holidays.
The Encyclopedia of World Problems and Human Potential is a collaboration between UIA and Mankind 2000, started in 1972. It is the result of an ambitious effort to collect and present information on the problems with which humanity is confronted, as well as the challenges such problems pose to concept formation, values and development strategies. Problems included are those identified in international periodicals but especially in the documents of some 60,000 international non-profit organizations, profiled in the Yearbook of International Organizations.
The Encyclopedia includes problems which such groups choose to perceive and act upon, whether or not their existence is denied by others claiming greater expertise. Indeed such claims and counter-claims figure in many of the problem descriptions in order to reflect the often paralyzing dynamics of international debate. In the light of the interdependence demonstrated among world problems in every sector, emphasis is placed on the need for approaches which are sufficiently complex to encompass the factions, conflicts and rival worldviews that undermine collective initiative towards a promising future.
Non-profit, apolitical, independent, and non-governmental in nature, the UIA has been a pioneer in the research, monitoring and provision of information on international organizations, international associations and their global challenges since 1907.