Managed-retreat schemes are still in their infancy, says Mr Rothwell, and currently cover only about 600 hectares.
The Fujisawa Sustainable Smart Town will consist of a targeted 1, 000 homes spread over 19 hectares.
Ghanaian farmers have six children on average and farm tiny plots of land of around two hectares.
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The change required is huge: the goal would be on flat lands per-farmer cultivation of 20-30 hectares.
To grow enough wheat to feed themselves, they would need about two hectares.
The average size of 80% of African farms is less than 2 hectares.
That company claims that they sold only 200, 000 mu of timber, not hectares.
Roland Garros is spread over 8.5 hectares, compared with Wimbledon which occupies more than twice its size in south-west London with 18.5 hectares.
In a supplementary question Bolivians will also be asked to choose to limit landholdings either to 5, 000 hectares (12, 400 acres) or to 10, 000 hectares.
The average plot is less than 10 hectares.
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The soon-to-go-on-sale Ceed hatchback is being produced in Kia's shiny, new factory a few minutes drive from Zilina, where the narrow valley expands to make space for a vast industrial complex stretching across 166 hectares.
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Goal for flat land is 20-30 hectares (49.4 to 74.1 acres) and for mountainous areas 10-20 hectares (24.7 acres to 49.4 acres).
The average Japanese farmer is 66 years old and tills 1.9 hectares of land.
An American study found that the manual teams pulled up an average of 20.5 hectares a day, while the spray planes covered 734 hectares a day.
Take Nashon Zimba, a 25-year-old peasant who grows maize, beans and tobacco on 1.8 hectares (4.5 acres) in Chiponde, a small village in Kasungu district, north-west of Lilongwe.
At 135.1 hectares (333.8 acres) the airfield has three tarmac runways, a control tower dating back to the 1940s, a fire station and various underground structures from the decade.
Valdivieso, the U.N. spokesman in Colombia, notes that displaced residents have lost about 15 million acres (6 million hectares).
The plan would see 400, 000 of the continent's 3.4 million hectares (8.4 million acres) razed.
The land deals we are talking about often relate to hundreds of thousands of hectares each.
Sao Paulo state, for example, has 170, 000 farmers with less than 30 hectares apiece.
Firefighting crews have been reinforced, with some 2, 300 firefighters tackling the blaze, which has blackened at least 2, 700 acres (1, 100 hectares).
The trust bought a neighbouring stubble field called Hullback's Grove in 2005 to expand Arger Fen to 120 acres (40 hectares).
In Indonesia this would mean putting palm-oil plantations not on forest land but on degraded land, of which it has perhaps 40m hectares available.
The problem is, the amount of arable land per person is shrinking, says the FAO, from 0.38 hectares in 1970 to 0.23 in 2000, to 0.15 in 2050.
In December 2011 the council earmarked one acre (0.4 hectares) for a possible expansion.
The order covers five acres (2.4 hectares) of St Peter's Waterside.
In the floods that started in July in Pakistan 21 million people were impacted, over 3 million lost their homes and their entire source of livelihoods, entire roads and infrastructure plants were wiped out in certain pockets, 1.5 million hectares of standing crop were destroyed.
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Over 400 people have died and about 1.6m hectares (4m acres) are now under water.
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