If an oiltanker can accidently pollute large ecosystems, why not, in turn, pollute our own ecosystem, the oil consuming creature, on purpose?
Dogwood, a Canadian organisation that supports sustainable living, nature, trees, animals and other hippie crap, must have been thinking the same. By the way,they hate oil in general. They thought it was about enough with oil-spills by oil-tankers and set up a campaign to bann them from the seas. Therefor they pasted around some cool posters, without any text.
Because who needs arguments when you have a cool concept?