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Deforestation
Eritrea is a small nation on the Horn of Africa. It has a Human Development Index of .38, meaning it is a country with low development.
Habitat Fragmentation
human population has been growing rapidly since before the year 1000 but human population does not have a limit to how high it goes but it's us that gives it a small limit of what it can cope with, food production, waste produce, crime rate, health service are all at risk of over population so the population only has a small limit and we are the only ones that give it the limit!
Presumably you mean "can the human population survive a glaciation". The human species can, and has survived previous glaciations but in relatively small numbers. The main population will not survive as their food producing land will be covered in ice and there is not enough land near the tropics to hold the full human population.
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Overcrowding or dense population.
pyloric
A mole
If the human population was reduced to a very small number of interbreeding individual then this small population, denied outbreeding, would have very little genetic variation. Humans, who went through a bottleneck event about 70,000 years ago, are considered a " small " species because they have little genetic variation in comparison to many other species. Google cheetah to see how this concept works.
The number of individuals in the population is the population's size. If a population is small enough you will be able to determine the size by counting the individuals.
Scientifically, it is called Population.