sentences:  He has endorsed the Global Zero Initiative, a plan to eliminate all nuclear weapons by 2030.Matlock has also signed an open letter of May 13, 2011 asking the implementors of the New START treaty between the U.S. Russia to make public the locations and aggregate numbers of nuclear weapons, in order to promote transparency and reduce mistrust.On Jan 18, 2011 he co-signed an open letter to President Obama urging a United Nations resolution condemning Israeli settlements in the occupied territory.