Final answer:
The world's population hit 7.17 billion in 2014 and is expected to continue growing, with projections estimating 9.7 billion by 2050 and 11.2 billion by 2100. The growth is primarily occurring in developing countries and poses challenges to food security, environmental sustainability, and resource management.
Step-by-step explanation:
In 2014, the world's population reached approximately 7.17 billion. This milestone is significant, not only as a reflection of human growth but also as a marker for future population trends. According to sources like the United Nations and the U.S. Census Bureau, the global population is expected to continue on an upward trajectory, potentially reaching 9.7 billion by 2050 and 11.2 billion by 2100. The rate of population growth varies significantly, with developing regions of Asia and Africa experiencing some of the highest increases. This exponential growth, which began centuries ago, has escalated particularly in the last few decades, and while growth rates may begin to decline in the future, the total number of humans is still projected to rise substantially.
Developing countries, due to high fertility rates combined with decreasing mortality rates and rapid industrialization, are expected to account for most of the world's population increase. These demographic changes pose challenges such as food security, political stability, and environmental sustainability. Despite growth slowing in some countries, the continued overall increase in population could lead to issues such as overpopulation and its associated impacts on ecosystems and biodiversity.
Understanding the dynamics of population growth is critical. Demography, which encompasses the study of fertility, mortality, and migration, plays a vital role in planning for these future changes. Planners and policy makers use this information to address the needs and challenges posed by an ever-growing human population.