WOTC - Security of food supplies

I asked this question in the Wisdom of the Crowd:

How can we ensure security of food supplies?

Here are the responses: (45 Votes)

36 % - Increase our sources of supply.
33 % - Use high technology to introduce high rise farming and reduce the use of land.
22 % - Have long term arrangements with neighbors to provide supplies at agreed prices.
9 % - Increase the land for farming and provide them at low prices.

See the pie chart at: 
http://www.wisdomofthecrowd.sg/chart.aspx?ID=1082