Reuters: German Chancellor Angela Merkel on Sunday called for a decision on where to store radioactive nuclear material after a scandal over leaks at a depot this week sparked a row about what to do with atomic waste. Environment Minister Sigmar Gabriel said last week his ministry would assume responsibility for the Asse facility in the state of Lower Saxony after he attacked the operators for presiding over years of leaks of radioactive waste. A report showed barrels of waste were …