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World human population has been growing since the end of the Black Death, around the year 1350. A mix of technological advancement that improved agricultural productivity and sanitation and medical advancement that reduced mortality have caused an exponential population growth.
There are three components of change: births, deaths, and migration. The change in the population from births and deaths is often combined and referred to as natural increase or natural change. Populations grow or shrink depending on if they gain people faster than they lose them.
|1||India||1 639 176|
|2||China||1 402 405|
|4||United States of America||379 419|
Population growth is based on four fundamental factors: birth rate, death rate, immigration, and emigration.
Macao, Monaco, Singapore, Hong Kong and Gibraltar are the five most densely populated.
Causes. A reduction over time in a region’s population can be caused by sudden adverse events such as outbursts of infectious disease, famine, and war or by long-term trends, for example sub-replacement fertility, persistently low birth rates, high mortality rates, and continued emigration.
They grow more slowly, reproduce less, and populations decline. … As predator populations increase, they put greater strain on the prey populations and act as a top-down control, pushing them toward a state of decline. Thus both availability of resources and predation pressure affect the size of prey populations.
China, India, and the United States will emerge as the world’s three largest economies in 2050, with a total real U.S. dollar GDP of 70 percent more than the GDP of all the other G20 countries combined. In China and India alone, GDP is predicted to increase by nearly $60 trillion, the current size of the world economy.
Within just seven years, India is expected to overtake China to become the world’s most populous nation. Nigeria is posting the fastest population growth and its population is expected to surpass the United States by 2050 making it the third most populous country.
In Syria, the population grew by about 5.32 percent compared to the previous year, making it the country with the highest population growth rate in 2021. Today, the global population amounts to around 7 billion people, i.e. the total number of living humans on Earth.
Population Growth Rate The two main factors affecting population growth are the birth rate (b) and death rate (d). Population growth may also be affected by people coming into the population from somewhere else (immigration, i) or leaving the population for another area (emigration, e).
2 Population is growing rapidly, far outpacing the ability of our planet to support it, given current practices. Overpopulation is associated with negative environmental and economic outcomes ranging from the impacts of over-farming, deforestation, and water pollution to eutrophication and global warming.
- Natality or birth rate.
- Mortality or death rate.
- Immigration or entry of new individuals of the same population into a given geographical area.
- Emigration or exit of existing individuals from the population to a different geographical area.
1. Greenland. The island nation of Greenland, 80% of which is covered by a massive glacier, is the 12th largest country in the world by area, but the least densely populated.