Marcelo Sánchez Sorondo1, Veerabhadran Ramanathan2. 1. Monsignor Marcelo Sánchez Sorondo is the Chancellor of the Pontifical Academy of Sciences and the Pontifical Academy of Social Sciences. pas@pas.va. 2. Veerabhadran Ramanathan is a council member of the Pontifical Academy of Sciences and a distinguished professor of climate sciences at the University of California, San Diego. vram@ucsd.edu.