In the past several months, the population division of the UN and the governments of India and China have released new and revised numbers on current population size, fertility, and mortality, and projections for the remainder of this century. Global population will reach 7 billion later this year, and is estimated to increase to more than 9 billion by 2050.

In the July 29 issue, Science will feature a number of expert demographers' reviews on existing population knowledge as well as their opinions on the implications of changes in population, both in terms of global issues and also specifically for China and India.

Make sure you get all of this great information -- sign up for your free copy of Science's special issue on population, today.