Green groups say a series of high-profile environmental accidents are making the case for tougher safeguards on the nation’s energy infrastructure.

The spill of a coal-cleaning chemical in West Virginia last week and a pair of recent North Dakota train wrecks involving crude oil expose the need for stronger federal protections, Democrats and environmental groups charge.

“It should make it harder for any member of Congress to say we don’t need safeguards and don’t need action, given what we are seeing,” said Jeff Gohringer of the League of Conservation Voters.

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