Fossil fuels and wind energize Great Lakes shipping

Two diverse energy sources will help power a Great Lakes shipping revival, according to the Economist. The development of shale gas and oil requires the transportation of heavy extraction equipment, the publication says.  And the giant turbines needed to harvest Midwest winds are a popular new cargo. An increase in energy supply that leads to a drop in costs could ramp up other manufacturing and perhaps additional shipping demand. The Economist also credits an expected shipping resurgence to currency fluctuations and removal of certain duties that spur the building of new vessels. The wet blanket?