The United Nations projects that by 2008 the urban population will make up more than of the total of Earth's population.

more than 50 percent.

Explanation:

In 2008, more than 50 percent of the total population of earth lives in urban areas because people come to urban areas in order to earn money for their family and achieve higher status in the society. In 2030, about 60 percent of population of earth will live in urban areas. There are a lot of opportunities of jobs in the urban cities while with the increase in population, the rural areas are also converted into urban areas.