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# Example from: http://www.islandseeds.org/wiki/Biofuel
# http://www.islandseeds.org/wiki/Biofuel
graph { flow: east; }
node { shape: ellipse; }
[ solar energy ] { fill: yellow; }
[ water] { fill: cyan; }
[ soil ] { fill: burlywood; }
-> [ vegetation ]
-> [ processing ]
-> [ biofuel ]
-> [ combustion ]
-> [ useful work ] { fill: lightgray; }
[ combustion ] -> [ carbon dioxide ]
[ combustion ] -> [ pollution ]
[ processing ] ..> [ compost ] ..> [ soil ]
[ processing ] ..> [ carbon dioxide ]
[ processing ] ..> [ pollution ]
[ water ] -> [ vegetation ]
[ solar energy ] -> [ vegetation ]
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