Washington, D.C. -- Scientists estimate roughly 1 1/2 million
tons of Japanese tsunami debris is floating in the Pacific
Ocean.  Computer models show that lighter pieces of debris,
affected by the wind, move faster than heavy debris. Thousands
of items, likely from the 2011 tsunami in Japan, have already
washed ashore in the U.S. and Canada.  There's potentially still
a lot to come, we just don't know, said Nancy Wallace, Director
of Marine Debris Program at the National Oceanic and Atmospheric
Administration.  NOAA estimates the largest concentration of
tsunami debris is floating between Hawaii and the west coast of
the United States.  Scientists don't know exactly where it will
land or when. Some debris may never wash ashore.  You know in
the old days, people would throw a message in a bottle, and you
never knew where they were going to come to. And that's kind of
what we are dealing with here, just on a really large scale,
said Wallace.  Related: Washed Away: Japanese Tsunami Debris
Piece of boat lost in