Less than three per cent of the world's oceans — that's about 20 per cent of the land area currently used in agriculture — would be needed to fully substitute for fossil fuels. A small fraction of that sea area would be enough to fully substitute for biofuel production on land.
source: http://www.cosmosmagazine.com/features/online/2040/diffusing-biofuels-debate-with-seaweed?page=0%2C1
[ L i q u i d N a t u r e s ] MLArch Diploma Spring 2012. The Oslo School of Architecture and Design (AHO)
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