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If today's global statistics of more than 3 billion malnourished people are worrisome, try projecting 50 years into the future, when Earth's population could exceed 12 billion and there could be even less water and land, per capita, to grow food.
Same source as above
Harvests of cereal grains, the mainstay of human diets and 80 percent of the world food supply, have increased slightly since 1985 but not nearly fast enough to keep pace with increases in population.
Rising malnutrition increases human susceptibility to other diseases, such as malaria, diarrhea and AIDS.
The prediction of a 12 billion global population by 2054 is based on the current rate of growth with each couple producing an average of 2.9 children. Even if nations' policy changes reduce the birth rate to an average of 2 children per couple, the 12 billion mark would be reached in 70 years.
Because more than 99.8 percent of human food comes from the land, doubling the planet's population will further stress resources for fresh water, renewable and fossil energy, fertilizers and pesticides.
For the most finite resource of all, land, each year more than 10 million hectares of cropland are degraded and lost because of soil erosion. This comes at a time when food production should be increasing dramatically to meet the needs of a rapidly expanding population. Pimentel noted that per-capita cropland has declined 20 percent worldwide in the past decade.