Seeing how they specifically mentioned China and Walmart as users of Port Alberta, heres an interesting article I found regarding China and its exports for Walmart:
http://www.aflcio.org/corporatewatch/walmart/walmart_5.cfm
Some tidbits from the article:
"Wal-Mart is the single largest importer of foreign-produced goods in the United States, and the majority of its private-label clothing is manufactured in at least 48 countries around the world—and almost none in the United States.
Wal-Mart’s biggest trading partner is China. The world’s largest retailer admits it bought some $18 billion in merchandise in 2004, from China, nearly 10 percent of all Chinese goods sold in this country that year. Through August 2005, the United States was running a $126 billion trade deficit with China.
The company says its inventory of products made in China was expected to hit $18 billion in 2004, the second consecutive year the inventory grew by more than 20 percent. More than 70 per cent of the products sold at Wal-Mart are made in China, according to the China Business Weekly.
More than 80 percent of the 6,000 factories in Wal-Mart's worldwide database of suppliers are in China. If Wal-Mart were a separate nation, it would rank as China’s fifth-largest export market, ahead of Germany and Britain."