Two days after pop tart Britney Spears announced that she was pregnant with her first child, environmental experts around the globe warned that Ms. Spears' husband, Kevin Federline, is reproducing at an alarming rate. Some of the world's most renowned experts in the field of ecology, attending a world environmental conference in Buenos Aires, said that by most measures Mr. Federline was reproducing at a pace that was not ecologically sustainable. "Mr. Federline had two children by his fiancée, Shar Jackson, whom he left to hook up with Britney," said Dr. Zang Liangyong of Beijing University. "He has produced three...