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Into models to determine where they originated? >> sure. as it turns out, understanding the currents of the ocean are very important to understanding climate change. so people have been studying those currents. the challenge here though it's been 500 days plus. it's over almost the width of the united states in terms of distance. it would be incredibly difficult. you would have to have just the right model and know enough about the ocean systems, the winds, storms and monsoons whether the item was floating above or below the water. my hope is that it at least puts -- i'm sure the models will b...

Year after. >> congressman ed markey from massachusetts basically accused bp of "carpet-bombing" the gulf with chemicals. do you agree with that statement? >> well, they use huge amounts. i think something like 1.8 million gallons. perhaps even more. that's a lot of dispersants. of course it was a big oil spill, too. >> national incident commander thad allen says, yes, we granted those waivers but it was done prudently and overall since the epa recommended that the use of dispersants be curtailed, that the use of those dispersants was actually down more than 75%. >> which is probably good. i t...