Availability of clean renewable energy is a critical issue affecting the future of humanity. It is one of the most significant constraints both on the lifestyles and on the number of people that will be sustainable in generations to come.
The future population growth of the world is difficult to predict accurately. A range of projections has been published by organizations such as the United Nations and the US Census Bureau, depending on different assumptions of birth rates and other factors affecting numbers.
These two concepts were developed by the Global Footprint Network (GFN) and are quantified as global hectares (gha). They provide a common basis on which to compare the biological capability of the environment to provide food and meet other essential needs, versus the demands placed by human communities on these ecological services.
Responding to ageing populations Populations around the world are ageing as life expectancy increases and as birth rates fall. At present, the increased proportion of elderly people in the population is generally higher in developed countries than in others, but ageing is increasingly becoming a global phenomenon.
Every other year since 2009, the International Conference on Family Planning (ICFP) has brought together the family planning community to share best practices, celebrate successes, and chart a course forward.