"The 19th Century "Golden Age of Sail" is seeing a revival as modern day cargo ships turn to wind power -- in a bid for eco-friendly travel.
(...)The industry contributes 4% of global carbon emissions, United Nations figures show. Indeed, it says that if shipping were a country, it would be the sixth-largest emitter of greenhouse gases in the world.
But it could be that the winds of change are on the horizon. From January next year, new International Maritime Organization regulations will require shipping companies to cut emissions by 20% over the next seven years and a further 50% by 2050."