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"Hillary Clinton's campaign has stressed her continuity with Obama's energy policy on key aspects such as decarbonization of the US economy, technological innovation and global cooperation. However, policy reforms to deliver long-term climate goals might be out of reach in a highly divided Congress."

"The role of market mechanisms for reducing greenhouse-gas emissions and the relationship between climate change policy and international trade were the topics of a side-event panel discussion on Friday at the Conference of the Parties (COP21), the United Nations Conference on Climate Change in Paris. The panel discussion, which was co-sponsored by the Harvard Project on Climate Agreements, addressed a variety of issues related to the emissions-reduction targets that countries are putting forward as part of a new agreement to be concluded in Paris."

"In addition to U.S. moves toward curbing carbon emissions, international attention on the issue is far more substantial than it was at the time of the 1997 Kyoto Protocol, according to panelists. That agreement covered just 14 percent of global carbon emissions, Stavins said. Countries responsible for 90 percent of today's emissions have already committed to voluntary reductions in advance of the Paris talks."

Iran’s top nuclear negotiator was heading back to Tehran on Sunday to consult with his nation’s leadership, as negotiators remained divided over how to limit and monitor Tehran’s nuclear program and even on how to interpret the preliminary agreement they reached two months ago.

Various journalists and advocates have, of late, described America's Regional Greenhouse Gas Initiative (RGGI) as being near "the brink of failure" thanks to the trend of very low prices of permits to emit carbon dioxide. Likewise, commentators have claimed that Europe's carbon market, the European Union Emission Trading Scheme (EU ETS), may be "sinking into oblivion" because its emissions allowances too have become very cheap. 

The effort to address climate change stumbled with the failure to pass cap-and-trade. What should happen now? Five experts, including the Harvard Project's Joe Aldy, discuss the future of U.S. climate and energy policy.