But demand and the demographic and economic change which drives it is unpredictable.

ECONOMIST: The south-east

Over the past few decades, a political, economic, social and demographic change in many parts of the world has stimulated migration of people to cities within and across countries.

UNESCO: THEMES

Mountain regions, particularly in tropical regions where they are prime human habitat, are increasingly threatened by climate change, demographic pressure, and economic development that in many cases lead to resource depletion and degradation, hindering the provision of critical goods and services to both mountain inhabitants and lowland communities.

UNESCO: OFFICE IN BRASILIA