Look back at a devastating oil spill that started exactly one year ago . And there 's fear that the oil we see in the marshes is only a fraction of what 's here . The Deepwater Horizon disaster in the Gulf of Mexico has been called "the worst environmental catastrophe since Chernobyl" and is still ongoing. Consider a challenge from CNN to volunteer 11 hours of your time in 2011 . Use the Daily Discussion to help students understand today 's featured news stories .
Look back at a devastating oil spill that started exactly one year ago . The Deepwater Horizon disaster in the Gulf of Mexico has been called "the worst environmental catastrophe since Chernobyl" and is still ongoing. Consider a challenge from CNN to volunteer 11 hours of your time in 2011 . Use the Daily Discussion to help students understand today 's featured news stories .