Fifteen Nobel laureates have signed on to a letter to world leaders ahead of this month’s U.N. climate summit, asking them to “devote part of your agenda to the many thousands of political prisoners held in Egypt’a prisons — most urgently, the Egyptian-British writer and philosopher, Alaa Abd el-Fattah, now six months into a hunger strike and at risk of death.” The majority of the Nobel literature laureates since 1986 signed the letter.