(13) - Cornell University (2007, August 14). Pollution Causes 40 Percent Of Deaths Worldwide,  ScienceDaily. - quoting David Pimentel, Cornell professor of ecology and agricultural sciences
Accesed Jan 26, 2008

"We have serious environmental resource problems of water, land and energy, and these are now coming to bear on food production, malnutrition and the incidence of diseases," said Pimentel. Of the world population of about 6.5 billion, 57 percent is malnourished, compared with 20 percent of a world population of 2.5 billion in 1950, said Pimentel.