Grow Your Own

(This list is to be taken with a grain of salt - and a borrowed cup of sugar. It's a possibly out of date list of those countries that are overpopulated in the sense that they have more people than they can sustain within their borders. It's called physiological density and is a measure of population per square kilometre of arable land)

Singapore
Hong Kong
Djibouti
Bahrain
Kuwait
Gaza Strip
Puerto Rico
Oman
US Virgin Islands
French Polynesia