Both ISIS and Ebola to be major topics at this week 's General Assembly special debate . Climate change is going to be the top focus on Tuesday . Obama to make an appeal to the United Nations not to let it stand alone . Leonardo DiCaprio , a U.N. messenger of peace , is to to attend .
Expect ISIS and Ebola to be major topics at this week 's General Assembly special debate . Climate change is set to be the top focus on Tuesday . Ukraine will make an appeal to the United Nations not to let it stand alone . Leonardo DiCaprio , a U.N. messenger of peace , plans to to attend .