evidence: Declining populations will ease the pressure eight billion people put on the planet. As the population and sustainability director at the Center for Biological Diversity, I’ve seen the devastating effects of our ever-expanding footprint on global ecosystems. But if you listen to economists (and Elon Musk), you might believe falling birthrates mean the sky is falling as fewer babies means fewer workers and consumers driving economic growth. [...] Lower fertility rates also typically signal an increase in gender equality. Better-educated women tend to have fewer children, later in life. This slows population growth and helps reduce carbon emissions. And when women are in leadership roles, they’re more likely than men to advance initiatives to fight climate change and protect nature. These outcomes are side effects of policies that are necessary regardless of their impact on population. [...] Population decline is only a threat to an economy based on growth. Shifting to a model based on degrowth and equity alongside lower fertility rates will help fight climate change and increase wealth and well-being.