US climate treaty pledge relies on uncertain Obama actions

The United States put forth its contribution Tuesday to a global climate treaty, relying entirely on a set of emission cuts ordered by President Barack Obama that may not survive beyond the end of his presidency. Environmental groups and like-minded governments hailed the U.S. pledge as substantial and ambitious, and Obama's aides waxed hopeful that the U.S. announcement would spur other countries to follow America's lead.

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