The world's population will reach 7 billion in 2012, even as the global community struggles to satisfy its appetite for natural resources, according to a new US government projection. There are 6.7 billion people in the world today. The United States ranks third, with 304 million, behind China and India, according to projections released by the US Census Bureau. Sri Lanka is ranked 53 this year with a population of 21,128,773 The world's population surpassed 6 billion in 1999, meaning it will take only 13 years to add a billion people.