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Russia's Medvedev calls Obama's nuclear summit a "complete success," but adds, "I hope we won't just go home feeling happy."  What will it take to sustain agreements to "lock down" nuclear materials?  Is the threat of nuclear terrorism overblown? Also, a major earthquake strikes the Dalai Lama's hometown. On Reporter's Notebook, will a tax on gasoline persuade Senate Republicans to support legislation on climate change?

Banner image: President Barack Obama (L) talks with President Nursultan Nazarbayev of Kazakhstan (C) and Russian President Dmitry Medvedev during the second plenary session at the Nuclear Security Summit in Washington, April 13, 2010. Official White House photo: Pete Souza


Making News Major Earthquake Strikes Dalai Lama's Hometown 7 MIN, 30 SEC

The latest massive earthquake — magnitude 6.9 -- struck a remote area of western China today, a region populated mostly by Tibetans. At least 400 are dead and some 8000 are said to be injured.  Professor Robert Barnett directs the Modern Tibetan Studies Program at Columbia University.

Robert Barnett, Director of Modern Tibetan Studies, Columbia University (@robbiebarnett)

Main Topic After the Nuclear Summit, What Happens Now? 36 MIN, 10 SEC

Nobody knows how likely it is that some terrorist group could set off a nuclear weapon.  But the consequences are so catastrophic that even a small chance justifies urgent action to reduce the risk. That was the idea behind President Obama's nuclear summit. Ukraine, Mexico, Chile, Kazakhstan, Vietnam and Canada have agreed to dispose of highly enriched uranium that might be made into bombs. But those and other commitments at the summit were voluntary, and "locking down" nuclear materials will be easier said than done. Even supporters call the 47-nation meeting a "first step." Opponents say it did nothing to put the brakes on Iran, which will hold its own conference this coming weekend. Others ask if nuclear terrorism is exaggerated in the first place.

Matthew Bunn, Principal Investigator, Harvard University's Project on Managing the Atom
Benn Tannenbaum, Program Director, American Association for the Advancement of Science's Center for Science, Technology and Security Policy
John Mueller, Professor of Political Science, Ohio State University
Barbara Slavin, Atlantic Council / Al-Monitor (@barbaraslavin1)

Atomic Obsession

John Mueller

Reporter's Notebook Senate Ponders 15-Cent-a-Gallon Gas Tax 6 MIN, 53 SEC

Climate change legislation passed by the House is stalled in the Senate, and the latest possible compromise features a tax on gasoline. Though new taxes are anathema to Republicans, Senator Lindsay Graham of South Carolina thinks a tax at the pump might be the way to get votes from his GOP colleagues. He's working with Democrat John Kerry of Massachusetts and Independent Joseph Lieberman of Connecticut. Jim Tanklersley reports on the environment for the Tribune Company's Washington bureau.

Jim Tankersley, New York Times (@jimtankersley)

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