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Main threats to the species are grazing and human overpopulation.
You could equally well argue that theres a human overpopulation."
Human overpopulation is still at the core of most of the environmental problems facing the Earth.
The Catholic Church is a primary culprit in human overpopulation.
Juliette Jowit's judgement in respect of human overpopulation is wrong.
Depending on which estimate is used, human overpopulation may or may not have already occurred.
At the same time he was outspoken against human overpopulation, which he called the "primary pollution."
Attenborough has repeatedly said that he considers human overpopulation to be the root cause of many environmental problems.
It is threatened by habitat loss arising from the deriving force of human overpopulation.
Some problems associated with or exacerbated by human overpopulation and over-consumption are:
Paul R. Ehrlich, entomologist and author on the subject of human overpopulation.
Subsequent human overpopulation and resultant deforestation led to collapse of the human society.
Monbiot does not think human overpopulation is a significant environmental problem, wheras Malthus does.
He therefore regards human overpopulation as "The Greatest Challenge" facing humanity.
Human overpopulation occurs if the number of people in a group exceeds the carrying capacity of the region occupied by the group.
He has also contributed extensively to understanding the scientific and socioeconomic ramifications caused by human overpopulation and environmental degradation.
I have been banging on about human overpopulation endlessly- and felt like a dog with its vocal chords removed, silently barking into the wind.
PRI argues against the notion that human overpopulation is occurring, and refers to itself as a "pro-life" organization.
A patient few observers each year see and count this endangered species to study the population, and to monitor its current decline from human overpopulation encroachment.
As Thomas Malthus described in his essay on the Principle of Population, human overpopulation is a serious issue, and one which can only become more pressing.
Most importantly, the problem of human overpopulation must be addressed immediately and a transition to a steady state economy is needed to guarantee environmental and societal sustainability.
Add in the time to digest Charles Lyell's geology of slowly evolving landscapes and Malthus's pessimistic predictions about human overpopulation.
In recent times, the focus has been on creating an awareness of the threat to ecosystems from human overpopulation and its consequent need for biological and physical resources.
To combat human overpopulation, a major reason for environmental degradation, he champions birth control, and he implores someone, anyone, to either "convert or silence" Carl Sagan.
Along with a fellow lepidopterist, Paul Ehrlich, he also helped found Zero Population Growth, an activist organization dedicated to preventing human overpopulation.