Five experts weigh in on today's population challenges
The Earth's human population is continuing to rise. The U.N. projects we will reach 7 billion people on October 31, 2011 and surpass 9 billion by 2050. Much of this growth will be uneven, however, with some nations having either a stable or shrinking population while other nations are expected to triple in size. Most of this rapid growth is in the poorer regions of the globe, which will likely increase the existing disparities (education, health care, and access to food, for example) between developed and undeveloped nations.