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Let's do the math again, but this time for the entire planet. The total land surface area of Earth is about 57,308,738 square miles, of which about 24% is mountainous and about 33% is desert. Subtracting this uninhabitable 57% (32,665,981 mi2) from the total land area leaves 24,642,757 square miles or 15.77 billion acres of habitable land.
Divide this figure by the current human population of 7 billion (that's 7,000 million people!) and you get just under one hectare (2.3 acres) per person. If all the habitable land on Earth were equally distributed among all human beings present on Earth, this is the per capita share of good land per person. Again, however, we have not allowed for any nice amenities such as roads, schools, hospitals, shopping malls, rivers, lakes, reservoirs, parks, golf courses, etc. Even so, could you live on 2.3 acres?
Efforts have been made to estimate the amount of land needed to sustain an average individual human (link). A person living the lifestyle of an average American requires almost 24 acres, ten times the world per capita share.
Originally posted by Numbers33four
The problem is not too many people. The problem is too many rich people who have no regard for the rest of the world.
Don't get me wrong. I know that there are plenty of poor people dynomiting fish.edit on 19-6-2012 by Numbers33four because: (no reason given)
Originally posted by Tw0Sides
Jokes aside, its not room thats the problem, its Resources.
In geography and agriculture, arable land (from Latin arō; “I plough, I farm”) is land that can be used for growing crops. It includes all land under temporary crops (double-cropped areas are counted only once), temporary meadows for mowing or market and kitchen gardens and land temporarily fallow (less than five years). Abandoned land resulting from shifting cultivation is not included in this category. Data for arable land are not meant to indicate the amount of land that is potentially cultivable. As such, it has to be distinguished from agricultural land, which, according to Food and Agriculture Organization's (FAO) definition, additionally includes
land under permanent crops as well as permanent pastures. In 2008, the world's total arable land amounted to 13,805,153 km², whereas 48,836,976 km² was classified as "agricultural land." 
Originally posted by thehoneycomb
So I got bored and figured out how many square miles a person would have to themselves if land was distributed to all of the approximate 7 billion of earths inhabitants equally. Each person alive would have about 12 square miles all to themselves.
So is the world overpopulated?
Total land area of the world 57,308,738 Sq. Miles
Total Population around 7 billion. (I used 7 billion)