Arable land covers 31 million square kilometers.
If every person on earth were given 1,000 square meters to grow food, we would all fit into Brazil.
If every family of four were given 700 square meters to grow food for itself, the entire world would fit into Iran.
Vegetables for a family of four can be grown on 200 square meters
If every human stood next to each other, four people per one square meter, we would all fit into the Istrian peninsula in Spain.
Elizabeth Nickson
"In the discussions to which this interest has given rise and in the arrangements by which they may terminate the occasion has been judged proper for asserting, as a principle in which the rights and interests of the United States are involved, that the American continents, by the free and independent condition which they have assumed and maintain, are henceforth not to be considered as subjects for future colonization by any European powers. "
-- James Monroe, speech to the US Congress on December 2, 1823