Abandoned fishing nets drift through the world's oceans like ghosts,
trapping sea turtles and snagging birds that dip down for a quick meal.
Often nearly invisible, old netting kills thousands of marine animals each
year.

And while locating these "ghostnets" in millions of square miles of ocean
is no easy task, Boulder researcher James Churnside believes he can
find them from space. Churnside is using a variety of satellite sensors to
locate areas where ocean currents and winds pile the debris in
"convergence zones."