Basic trends have been decline in land under cultivation and decline and aging of farming communities.

FORBES: Reforming Japan's Socialized Agriculture (2)

In Slovenia, untamed forest still exceeds land that has been brought under cultivation.

BBC: Snowbound Slovenia

According to Cristina Milesi, a research scientist working at NASA's Ames Research Center, lawns are America's largest irrigated crop, with 63, 240 square miles under cultivation.

FORBES: Magazine Article

Here the solution is to increase the per-farmer area under cultivation.

FORBES: Reforming Japan's Socialized Agriculture

His office said the increase in land discovered to be under cultivation came about because the survey area had been increased, in an attempt to improve its comprehensiveness.

BBC: NEWS | Americas | Coca-growing spreads in Colombia

But that's still barely a trickle in a country with total farmland under cultivation of 300 million acres, of which less than half is irrigated at all.

FORBES: Magazine Article

Expanding supply at the same rate will be difficult, because the amount of arable land under cultivation is growing by only a fraction of a percentage point each year.

ECONOMIST: No matter how bad things get, people still need to eat

Under the French protectorate, cannabis cultivation was eradicated in most of Morocco.

ECONOMIST: Why it is hard to stop Moroccans growing a lucrative crop