The oil fever is tapering off, as is the inflationary fever that hit the steel industry and international shipping.

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Around 90% of world trade is currently carried by the shipping industry, according to the International Maritime Organization.

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Attacks peaked in 2011, but have declined sharply since, largely because of increased mobilization of international naval forces and tighter security adopted by the shipping industry.

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"I would say a good 95% of (shipping industry green initiatives) is incentivized or is driven by international regulations, " he said.

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