How does the growth of the world's population today compare with its growth 100 years ago?
explain why the changes have taken place.
Today's world population growth compared to the population growth 100 years ago is a big, big difference. The population has doubled many, many times, and even right now the world's population is still skyrocketing. There are several reasons for this. There have been scientific advances in health and medicine. Governments are providing cleaner public drinking water and more sanitary waste removal. With this, people are less likely to get sick. Another reason for rapid population growth is agriculture. Scientists have created newer, better methods to increase the world's food supply, and to make it healthier. They have created method's to protect crops from harmful insects, and to raise crops with less water. This is called the Green Revolution.
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To compare the growth of the world's population today with its growth 100 years ago, we need to gather data from both periods.
First, let's determine the world population growth 100 years ago. In 1921, the world population was approximately 1.9 billion. To calculate the growth rate, we subtract the population of 1921 from the population today and divide it by the population in 1921:
Population growth rate = (Current population - Population in 1921) / Population in 1921
Now, let's gather the current world population data. As of September 2021, the estimated world population is around 7.9 billion. Plugging this value into the calculation, we can evaluate the growth rate.
Population growth rate = (7.9 billion - 1.9 billion) / 1.9 billion
By solving this equation, we find that the growth rate over the last 100 years is approximately 317%.
Now, let's address the reasons behind the changes in population growth over the past century.
1. Decline in mortality rates: One significant factor contributing to the population growth is the substantial decline in mortality rates. Advances in healthcare, improved sanitation, access to clean water, and vaccinations have greatly reduced infant mortality rates and increased life expectancy. This has led to more people surviving into adulthood, resulting in a larger population.
2. Technological advancements in agriculture: Agricultural advancements, such as the Green Revolution, have significantly increased food production. Improved farming techniques, irrigation systems, and the use of fertilizers and pesticides have allowed countries to produce more food and support larger populations.
3. Improved standard of living: Over the past century, global living conditions and standards of living have improved, leading to a decrease in poverty rates. Access to education, better job opportunities, and reduced political conflicts have contributed to a decline in birth rates in some regions. When people feel secure about their future and have access to resources, they often choose to have fewer children, which impacts population growth.
4. Urbanization and industrialization: The shift from predominantly rural agrarian societies to urbanized industrial centers has also played a role in population growth. Urban areas tend to have higher population densities, leading to faster rates of population growth as people naturally have more interaction in these environments.
It's important to note that population growth is influenced by various complex factors, including cultural, social, economic, and political aspects. These factors can vary across different regions and countries, resulting in different rates of growth.
http://ourworldindata.org/world-population-growth/
Better medications and diet help people to live longer.