Just a few months ago, experts were talking about the "renaissance" of the nuclear power industry.  After more than two decades of relatively safe operations and with public demands growing for clean, carbon-free power plants, many nations, including the United States, seemed ready to embrace nuclear energy as a clean, safe and efficient alternative to fossil-fuels. And then came the March 11th earthquake and tsunami that severely damaged the Fukushima-Daiichi reactor complex in Japan.  Worldwide, countries like China with active nuclear power projects put them on hold for review, while Germany and several other countries simply canceled them.  Overnight, new doubts have arisen about the future of nuclear power.  Zulima Palacio has the story.