World population could be higher than expected

Finnish scientists have found that the world's population could be several billion higher than official figures due to errors in counting rural populations. The researchers analyzed data from 1975 to 2010 and found that the rural population was underestimated by 53 to 84 percent. They are proposing to review the methods of counting population, because even small differences play a role in planning public services and predicting the effects of climate change. Some experts say that modern technology can reduce the level of error.