How a single word could've derailed the entire climate change pact

Nearly every nation in the world approved a historic climate change deal Saturday, but getting to that point wasn't easy. One last-minute quibble was over a single word, Politico explains:

Why the big fuss? Earlier drafts used "should" instead of "shall," a term that is legally binding in United Nations documents. If the U.S. hadn't worked to get "should" back in instead, the deal may have required final approval from the Republican-controlled Senate — a hard sell.

"When I looked at that, I said, 'We cannot do this and we will not do this,'" Secretary of State John Kerry told reporters. "'And either it changes or President Obama and the United States will not be able to support this agreement.'"

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