Another Life - Ulibarri Sarena

Finding out who you were in a previous life sounds like fun until you're forced to grapple with the darkness of the past. Galacia Aguirre is Mediator of Otra Vida, a quasi-utopian city on the shores of a human-made lake in Death Valley. She resolves conflicts within their sustainable money-free society, and keeps the outside world from meddling in their affairs. When a scientific method of uncovering past lives emerges, Galacia learns she's the reincarnation of Thomas Ramsey, leader of the Planet B movement, who eschewed fixing climate change in favor of colonizing another planet. Learning her reincarnation result shakes the foundations of Galacia's identity and her position as Mediator, threatening to undermine the good she's done in this lifetime. Fearing a backlash, she keeps the results secret while dealing with her political rival for Mediator, and outsiders who blame Otra Vida for bombings that Galacia is sure they had nothing to do with. But under the unforgiving sun of Death Valley, secrets have a way of coming to light.