"...based on recent mitochondrial DNA (mDNA) evidence, of the world migrations of the human species from East Africa to around the world."
The world population currently stands at approximately 7.1 billion, with some speculation the growth will soon approach asymptotic , whereas other research suggests we may actually face a declining world population in the coming years.
As with much scientific modeling, interpretation relies upon which oracle you deem reliable. Your mileage may vary.
Update: "We are a plague on the Earth." Uh, oh. There goes the neighborhood.