The compound readings have stabilized worldwide. For atmospheric scientist Dr. Mara Sevik, this should mean the crisis is over. Instead, it signals something far more profound: the completion of a planetary transformation forty-three years in the making. From the alkaline flats of Tule Lake to the cerrado of Brazil, the evidence is undeniable. Earth's biosphere is becoming something new. Some populations are adapting. Others are not. And in research stations across six continents, scientists face an impossible choice between disclosure and complicity. The becoming cannot be stopped. But it might still be understood.