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U.N. prepares for landmark climate summit as Trump continues rollback of environmental policies

President Trump is vowing to block an auto emissions rule in California that would put in place stricter regulations than at the federal level. Meanwhile, world leaders are preparing to meet in New York City for the U.N.'s landmark climate summit. Mark Hertsgaard, environmental correspondent for The Nation, joins CBSN to discuss what could be the most significant week for climate change since the Paris Agreement was signed in 2015.
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