By David Loyn
International development correspondent, BBC News
Tens of thousands of people worldwide are joining a mass rally to raise money and awareness about rising food costs.
The rally begins on the east coast of Asia and will continue across a series of countries, finishing on the west coast of the United States.
End Hunger: Walk the World aims to have a walk going on somewhere in the world during a 24-hour period.
Organised by the World Food Programme, the rally aims to raise money for WFP programmes for feeding school children.
Rome summit
The WFP's appeal for emergency aid to fill the gap left by rising prices this year has been answered, partly by a huge $500m payment by Saudi Arabia.
But the demand for more food aid will remain high in the future as food prices are not expected to fall to levels seen before the present crisis.
An emergency summit in Rome this week will consider longer-term solutions to the problem, including more investment in agriculture in Africa. The organisers of the Walk the World rally expect their biggest turnout to be in African countries, including Tanzania and Malawi.
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