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These projections help to forecast the population's impact on this planet and humanity's future well-being. [97] Models of population growth take trends in human development, and apply projections into the future [98] to understand how they will affect fertility and mortality, and thus population growth. [98]
Overpopulation or overabundance is a state in which the population of a species is larger than the carrying capacity of its environment.This may be caused by increased birth rates, lowered mortality rates, reduced predation or large scale migration, leading to an overabundant species and other animals in the ecosystem competing for food, space, and resources.
Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.
After becoming involved in the environmental movement as a college student in the 1970s, Knight attributed most of the dangers faced by the planet to human overpopulation. [2] [6] He joined the Zero Population Growth organization, [2] and chose to be vasectomized at age 25. [6]
[13] [14] The Optimum Population Trust (now called Population Matters) has listed what they believe is the overshoot (overpopulation) of a number of countries, based on the above. [15] In one study [16] published in January 2021 in Frontiers in Conservation Science, the significance of overshoot is discussed.
It can be measured by the ecological footprint, a resource accounting approach which compares human demand on ecosystems with the amount of planet matter ecosystems can renew. Estimates by the Global Footprint Network indicate that humanity's current demand is 70% [27] higher than the regeneration rate of all of the planet's ecosystems combined ...
A nuclear conflict involving less than 3% of the world’s stockpiles could kill a third of the world’s population within two years, according to a new international study led by scientists at ...
Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...