FILE - In this Friday, Sept. 21, 2018 file photo, former U.S President Barack Obama speaks as he campaigns in support of Pennsylvania candidates in Philadelphia. Former U.S. President Barack Obama has on Wednesday, Sept. 26 taken a swipe at President Trump's attitude to the environment, saying the world needs "political and social commitment" to achieve sustainability. "Unfortunately we have a U.S administration that deals differently around these issues," he told business leaders at a wide-ranging talk in the Norwegian capital, Oslo. (AP Photo/Matt Rourke, file)
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