New official estimates of the leak suggest the oil leak in the Gulf of Mexico has far eclipsed the previous worst oil spill in US history - the 1989 Exxon Valdez disaster.

President Obama will later visit the area of the spill.

Dr. Manouchehr Takin, senior analyst with the Centre for Global Energy Studies and senior climate adviser at Greenpeace, Charlie Kronick discuss the impact of the leak on offshore drilling and the environmental respectively.

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