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What is the point of them? why do we need sharks? >> well, it's an interesting question and it certainly is not the way a scientist would look at that question. we don't like a point to anything being here. you're here because you made it through the evolutionary pathway. they are the number one dog in the food chain. when they disappear they become the canary in the coal mine that says we're not taking care of the ocean correctly. when we go to an echo system that had sharks and they vanished, there is something wrong. >> does climate change have any impact on the shark population? >> climate...

free after being accused of throwing fire bombs during recent violent protests in cairo. we are monitoring their moves. also this morning, an american journalist, we'll get back to our jason carroll there in just a second. the other story i need to tell you about, also in egypt. someone you have seen on our air here at cnn a number of times. an american journalist who has appeared here with us says she was blindfolded, beaten and sexually assaulted by egyptian police. she is now free and speaking out. we will be live in cairo in just a minute. but, back home, here on this thanksgivin...

Cleaned, quote, unquote, but every day something new washes ashore. some new layer. if you just glance at it you might think it's pebbles but what it is, all of these, are tar balls. >> here we go. just mushy, gross. >> you can smell it. >> you can smell the hydrocarbons which means there's some toxicity to these. >> potentially, yes. >> these will be present for decades but scientists say they are relatively nontoxic. the greater concern is the unknown. after the introduction to so much oil to the gulf coast, scientists are still not sure how the echo system will respond. >> once you take a s...

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