this is about the exxon valdez oil spill and the gulf of mexico oil spill

1. Exxon valdez oil spill

3. Almost 20 years after the spill, a team of scientists at the University of North Carolina found that the effects are lasting far longer than expected. The team estimates some shoreline Arctic habitats may take up to 30 years to recover. Exxon Mobil denies any concerns over this, stating that they anticipated a remaining fraction that they assert will not cause any long-term ecological impacts, according to the conclusions of 350 peer-reviewed studies. However, a study from scientists from the NOAA concluded that this contamination can produce chronic low-level exposure, discourage subsistence where the contamination is heavy, and decrease the "wilderness character" of the area. http://en.wikipedia.org/wiki/Exxon_Valdez_oil_spill

4. Gulf of mexico oil spill