if the leak takes months to plug as some have predicted, this could be the worst environmental disaster in our nation's history. joining us is the president and chief executive officer of the national wild life federation. good to have you here. >> great to be here with you. >> what's the long-term impact. we don't know what the magnitude of the spill is, but what do you think of the long-term impact. >> it's similar to the exxon valdez. the scientist dug in the sand in prince william sound and found oil in half of the holes they dug. so the oil is still in alaska in the prince william sound from the exxon valdez. the scientists have looked at the wild life that were impacted. one third were fully recovered, two-thirds are still in recovery 20 years later. if you have an oil spill of this magnitude if it gets in the wetlands and does the damage that we fear it will do before it over, it will have a