Why should we care that humans have set in motion the sixth mass extinction of species in earth’s history and a degree of climate change that risks our civilization? Rationally speaking, species come and go, including our own. Caring about the environment is a matter of the heart, about what we truly value, what is sacred to us. Tikkun holds that an environmentalism that doesn’t explicitly challenge the ethos of materialism and selfishness generated by global capitalism, which leads people to consume recklessly and without regard to the consequences for the planet, will fail. A successful environmentalism must also consciously connect with and draw on the deepest wells of spirituality in our culture, our awe and wonder at the universe, and our ability to care for each other. In these articles, scientists, activists, spiritual teachers, and others cover the territory.