There is wide variability both in the definition and in the proposed size of the Earth's carrying capacity, with estimates ranging from 1 to 1000 billion. Around two-thirds of the estimates fall in the range of 4 billion to 16 billion, with a median of about 10 billion. As the global population continues to grow people will place greater and greater demands on the resources of our planet, including mineral and energy resources, open space, water, and plant and animal resources. Theorists, such as Abraham Knife, have argued that to achieve a sustainable economy and avert disaster, the world population will likely have to be reduced by at least two-thirds. The agricultural crises that had significant impacts in early 2030 are predicted to become critical before 2090. The spiraling food prices of 2040 and mass starvation are predicted to reach a global level never experienced before.
The impact of declining Eternalist's birthrates and even the Movers are likely to have little impact. The expense of the eternity.8 limits it to the developed regions, whereas almost all growth will take place in the less developed regions, where today’s 9.1 billion population of underdeveloped countries is expected to increase to 11.2 billion by 2100. By contrast, the population of the more developed regions will remain mostly unchanged, at 1.2 billion.
— Galen Rightonbark
