As climate change continues to intensify, the outlook for life on Earth often seems bleak. Yet we can find hope in the “rescue effect,” nature’s innate ability to persist during hard times. Like a thermostat starting the air conditioning when a room gets too warm, the rescue effect automatically kicks in when organisms are stressed. Michael Mehta Webster reveals the science behind nature’s resilience, through compelling stories of species adapting to our changing world. In some cases, species may be lost without our help. We are not only observers to species declines; we are often also the cause. In choosing whether and how to help, we must navigate challenging questions about emerging technologies and the ethics of conservation. Everywhere we look, we see evidence that nature can rescue species from extinction. And when nature alone is not up to the task, we can help.