Tweet photo by Deepwater Horizon Response (source: Flickr Creative Commons) US President Barack Obama’s energy advisor Carol Browner has called the oil spill in the Gulf of Mexico ‘the worst’ environmental disaster to ever hit the United States. Browner also warned that the leak might not be stopped before August. The amount of oil leaking from BP’s Deepwater Horizon oilrig has now surpassed 1989′s Exxon Valdez spill in Alaska. From a BBC News report: At least 20 million gallons have now spilled into the Gulf of Mexico, affecting more than 70 miles (110km) of Louisiana’s coastline in the worst oil disaster in US history. Top kill has now officially failed, next in line is a method using robots called ‘slice and cap’. BP, who claims that it is being unfairly victimized, has so far spent $940m (£645m/€766) attempting to contain the oil leak. Additional resources: BP, White House Oil Spill Blame Game Heats Up SUBSCRIBE TO NEWSLETTER Thank you, your sign-up request was successful! Please check your e-mail inbox. Given email address is already subscribed, thank you! Please provide a valid email address. Oops. Something went wrong. Please try again later.