The rules are mostly voluntary, which disappoints environmental groups, but they should ratchet down the amount of leaked methane from new or modified oil and gas operations, which contributes to climate change.
The U.S. House passed legislation to approve the pipeline on Friday and the Senate is expected to take up the issue in coming weeks. President Obama has threatened a veto. In the meantime, a legal challenge over the route the pipeline would take through Nebraska has been resolved — for now.
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