POPULATION AND ARABLE LAND ON EARTH
7/16/2006
Arable land/
Land Arable Arable Arable Pop Farms Farmers
Unit Year sq km % sq km acres Population acres/indiv. No. %
US 1820 9,158,960 19.32 1,769,511 437,240,196 9,638,000 45.37 71.8
US 1850 9,158,960 19.32 1,769,511 437,240,196 23,191,876 18.85
US 1900 9,158,960 19.32 1,769,511 437,240,196 76,212,168 5.74
US 1920 9,158,960 19.32 1,769,511 437,240,196 106,021,537 4.12
US 1930 9,158,960 19.32 1,769,511 437,240,196 123,202,624 3.55
US 1940 9,158,960 19.32 1,769,511 437,240,196 132,164,569 3.31 6,300,000 17.4
US 1950 9,158,960 19.32 1,769,511 437,240,196 151,325,798 2.89
US 1960 9,158,960 19.32 1,769,511 437,240,196 179,323,175 2.44
US 1970 9,158,960 19.32 1,769,511 437,240,196 203,302,031 2.15
US 1980 9,158,960 19.32 1,769,511 437,240,196 226,542,203 1.93
US 1990 9,158,960 19.32 1,769,511 437,240,196 248,709,873 1.76
US 2000 9,158,960 19.32 1,769,511 437,240,196 281,421,906 1.55
US 2003 9,158,960 19.32 1,769,511 437,240,196 290,342,554 1.51 2,172,000 2.5
US 2005 9,158,960 19.32 1,769,511 437,240,196 295,734,134 1.48
Arable land/ Like US
Land Arable Arable Arable Pop Land Use
Unit Year sq km % sq km acres Population acres/indiv. in
World 1850 148,940,000 10.58 15,757,852 3,893,711,885 1,175,000,000 3.31 1940
World 1900 148,940,000 10.58 15,757,852 3,893,711,885 1,600,000,000 2.43 1960
World 1930 148,940,000 10.58 15,757,852 3,893,711,885 2,000,000,000 1.95 1980
World 1950 148,940,000 10.58 15,757,852 3,893,711,885 2,519,470,000 1.55 2000
World 1960 148,940,000 10.58 15,757,852 3,893,711,885 3,023,812,000 1.29
World 1970 148,940,000 10.58 15,757,852 3,893,711,885 3,696,588,000 1.05
World 1980 148,940,000 10.58 15,757,852 3,893,711,885 4,442,295,000 0.88
World 1990 148,940,000 10.58 15,757,852 3,893,711,885 5,279,519,000 0.74
World 2000 148,940,000 10.58 15,757,852 3,893,711,885 6,085,572,000 0.64
World 2003 148,940,000 10.58 15,757,852 3,893,711,885 6,302,309,691 0.62
World 2005 148,940,000 10.58 15,757,852 3,893,711,885 6,464,750,000 0.60
Notes:
1. CIA Yearbook 2003 and World Almanac 2002 and 2006 data.
2. One acre (208.7 ft x 208.7 ft) equals 4,047 sq meters or 0.4047 hectare. 
3. A world of peasant farmers might support 1 to 2 billion people, not 6.5 billion.
4. Interestingly, the world population was about 1 billion in 1850 and 2 billion in 1930.
5. To see if farming is possible on Mars, Venus, or our Moon, see:  NASA.htm