As we begin our observance of the Three Weeks we turn our attention to an exploration of the spiritual, halakhic, and ecological dimensions of shemitta presented in Yedidya J. Sinclair’s thoughtful new translation of “Shabbat HaAretz” by Rabbi Abraham Isaac Kook (Maggid Books). Ariel Evan Mayse suggests that the volume is an extremely timely contribution, given the perilous potential ecological calamities humanity faces.