It has a long history in the UK: 350 years ago the Levellers, or Diggers, seized land for food production.
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But unlike biodiesels based on soya or other plants, it does not divert crops or land from food production into fuel production.
Although the crocodiles spend most of their life in salt water, they are not considered marine animals as they rely on land for food and water.
The origins of Ati-Atihan date back to the 13th Century, when a group of lighter skinned Malay immigrants from Borneo chose to show their respect for the local Ati people by painting their faces black and singing and dancing in thanks for the land and food that was offered to them.
The battle of Kunduz is important because this is the land route the food will pass through.
The replacement of draft animals by machines released about 25% more land for growing food for human consumption.
President Lula has rejected criticism from President Chavez and others that the use of ethanol as a biofuel would use up valuable arable land and increase food prices.
Clearing land to plant food for biofuel releases the greenhouse gas carbon dioxide (CO2) through ploughing and can involve deforestation, which reduces the "carbon sinks" - the trees that absorb CO2.
The practice became more widespread in the community after a small number of individuals who were held in high esteem because of their community spirit applied it successfully to create land and produce food.
They argue that it drives up food prices by turning over land that would have been used to produce food crops to those that can be turned into fuel for transport.
Mr Fujimori's people abused the resources of the state, offering food and land to voters.
The vast majority of the world's poorest people farm small plots of land to grow their food and earn an income.
They can grow in the most hostile of regions such as deserts so don't infringe on land set aside for food crops.
Whether grown in bioreactors or in desert ponds, algal oil mostly sidesteps the food and land conflicts that potentially can limit other biofuels.
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But the alternative, growing those crops on existing farmland, would encourage the clearance of more land to grow the food crops that had been displaced.
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And it prevents food for land-locked Ethiopia arriving through the Eritrean ports of Massawa and Assab, from where it could be carried on by rail.
They already compete for food, land and jobs with more than 200, 000 stateless Rohingyas, who live around Cox's Bazar, one of the poorest parts of Bangladesh.
It runs about 30 degree and post-graduate courses in agriculture, business, equine, food, land and property management and is planning to change its name to Royal Agricultural University.
Dr Feng counters fears about a grain embargo, by pointing out that any land used in other food production could fairly quickly be re-converted to grain in an emergency.
But the prices of food, land and agricultural commodities could be driven up, it warns, with major impacts in poorer countries where people spend a much greater share of their incomes on food than in developed nations.
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This leaves more land for the generation of food and other products while satisfying growing demand for renewable energy.
"Biofuels, like palm oil, produce more carbon emissions than they save, fuel land grabs and increase global food prices, " she said.
The work and produce of the fishermen and shepherds still give Sardinia an extraordinary culinary culture, one strictly divided into food from the sea and food from the land.
Think back 200 years, when 80% of the people had to work on the land to produce the surplus food to feed the other 20% who did everything that was not agriculture.
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Algae at least can be grown, with sufficient engineering, on a large scale that does not require prime crop land in competition with growing food crops (as rules out conventional biofuel strategies beyond grants from governments and the European Union), and there is no demand for freshwater since saline water does even better to promote the growth of certain highly oil-yielding strains.
Owners often offer a variety of food from their own land and local growers such as Olafsson.
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