In 2013, global emissions of greenhouse gases rose 2.3 percent, scientists reported Sunday in the journal Nature Geoscience.
The numbers were reported by the Global Carbon Project tracking initiative, and released prior to a United Nations summit on Tuesday that will attempt to tackle climate change. Scientists say there's no sign that U.N. member nations will agree to more ambitious efforts to curtail emissions, but they insist that changes need to be made — and soon.
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