This growing population density has spawned a host of environmental issues and creative solutions.
It has a dangerous mix of poor sanitation, high population density and limited health services.
Other states have warmer weather and lower taxes, union membership, population density, and cost of housing.
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For Riis, the slum's biggest problem wasn't population density, lack of sunlight or even disease.
The population density in the Russian Far East is barely one person per square kilometre.
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California, which receives a third of America's immigrants, has a population density higher than Europe's.
Starting with buses, which operate in areas with the greatest population density, China can do the same.
In fact, New Jersey has a higher population density than any country in Europe except the Netherlands.
One study has suggested that the tax system alone reduces the population density in urban areas by 15%.
Population density not only increased the vulnerability of urban centres but magnified the impact of natural disasters, delegates heard.
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Demographic information such as median income and population density are from the U.S. Census Bureau's most recent ZIP code survey.
One other factor has to do with the population density or poverty.
Above all, Kent had a vision to build a cable company that operated in second-tier suburban markets and college towns with low population density.
Clearwire is not building a nationwide system but will focus on large communities with population density where the bulk of the demand is centered.
Scots ministers said a new formula for allocating funding was based on population density, meaning areas like the Highlands would be particularly badly hit.
An example of a better approach might be to group retail sites by high, medium and low population density in the surrounding 10 mile area.
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And that was at a time when the congestion arising from development and population density of the area was nothing like what it is today.
Yet its population density is lower than that of Los Angeles.
Clearly, the success of Detroit Future City depends on building population density around certain neighborhoods that are already in decent shape and stabilizing home values there.
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The lost amenities and added population density, they said, would cut their property value by a third, and they were not going to take it lying down.
High population density, a poor ratio of available water to demand, and regional imbalances in available water supplies are serious challenges for China in managing its usable water supply.
The criteria considered include population density, the distance to underground geological formations suitable for carbon sequestration, seismic activity, terrain, proximity to airports, military bases and so on and so forth.
In July and August, the population density and traffic becomes so thick with vacationing Romans that one can push their car across the capital, Portoferraio, at about the same pace as driving it.
Levels of key nutrients, such as phosphate and nitrate, are highest in the Midlands, East and South of the country where population density is highest and farming methods the most intense.
Kazakhstan has additional obstacles: Cold weather, few tennis courts and a large land mass with low population density, which makes for expensive travel and greater difficulty in creating clusters of talent.
Tourism is creating other problems for the local environment, too, including increased population density, over-dependence on wood as a fuel and construction source and the overgrazing and cutting of mountain slopes to feed livestock.
There are also huge differences in population density across the country, with the population per square kilometre ranging from nine in Eilean Siar (the Western Isles) and the Highlands to 3, 395 in Glasgow.
Probably this worry derives from the difference in population density between urban and rural or small town areas, but there is a tacit implication that non-urban dwellers are more expendable than urban dwellers.
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As I describe above, the 2000 favelas in the municipality of Sao Paulo are a vast terrain whose expanse and extreme population density are a deterrent to easy policing and even state military action.
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