National: Nuclear power is making a comeback. And despite a decades-old debate over its environmental impact, the advocates of nuclear power seem to be winning. In February, the US president, Barack Obama, unveiled $8 billion (Dh29.4bn) in loan guarantees to break ground on the construction of the first nuclear power plant in the US in 30 years, saying the country had to move past "the same old debates between Left and Right, between environmentalists and entrepreneurs". Mr Obama said …