Jay Famiglietti is director of science for the Arizona Water Innovation Initiative and a renowned hydrologist (formerly with NASA and the Jet Propulsion Lab) who researches water and climate change. He can discuss groundwater, freshwater, atmospheric rivers, droughts, floods, water security, how water works and moves and policy affecting its use.| newsroom.asu.edu
In 1950, five years after the founding of the United Nations, world population was estimated at around 2.6 billion people. It reached 5 billion in 1987 and 6 in 1999. In October 2011, the global population was estimated to be 7 billion.| United Nations