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Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.
The two great economic revolutions that marked human history up to 1900—the agricultural and industrial revolutions—greatly increased the Earth's human carrying capacity, allowing human population to grow from 5 to 10 million people in 10,000 BCE to 1.5 billion in 1900. [44]
Estimates of population evolution in different continents between 1950 and 2050 according to the United Nations. The vertical axis is logarithmic and is in millions of people. (2011) World population growth rates between 1950 and 2050. The world population growth rate peaked in 1963 at 2.2% per year and subsequently declined. [9]
The UN Population Division report of 2022 projects world population to continue growing after 2050, although at a steadily decreasing rate, to peak at 10.4 billion in 2086, and then to start a slow decline to about 10.3 billion in 2100 with a growth rate at that time of -0.1%.
The world’s population is expected to grow by more than 2 billion people in the next decades and peak in the 2080s at around 10.3 billion, a major shift from a decade ago, a new report by the ...
The current world population growth is approximately 1.09%. [8] People under 15 years of age made up over a quarter of the world population (25.18%), and people age 65 and over made up nearly ten percent (9.69%) in 2021. [8] The world population more than tripled during the 20th century from about 1.65 billion in 1900 to 5.97 billion in 1999.
In the future, even more water will be needed to produce food because the Earth's population is forecast to rise to 9 billion by 2050. [63] In 2000, the world population was 6.2 billion. The UN estimates that by 2050 there will be an additional 3.5 billion people, with most of the growth in developing countries that already suffer water stress ...
By RYAN GORMAN Earth could be teeming with more than 12 billion humans by the end of the century, a new study has revealed. The world's human population currently stands at about 7.5 billion. A ...