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In the aftermath of September 11 , the economic outlook has become still weaker and subject to significant risks , and investors and consumers have become much more cautious . Because the lake is so remote , experts assumed infected birds had flown up from southern China.Suspected : nearby farmed geese , not migrants from afar , might have infected birds at Qinghai Lake.CHINA PHOTOS / GETTYBut it has now emerged that , since 2003 , one of the key migratory species affected , the bar-headed goose , has been artificially reared near the lake . Things have changed before , and they will change again . Ice conditions have been fairly stable in the Northwoods with most lakes having about 10 inches of ice . " The number of twin births and , as a result , low birth weight babies , has climbed sharply in the past few decades .