Eileen Crist knows more than a person should, more than seems healthy, about dying birds and dying watersheds. She’s keenly aware of the global crisis of biodiversity loss and ecological collapse, and she sees what’s driving it: direct causes like climate change and what she calls the “ultimate causes” — population growth, overconsumption, and technological power. But the thing that really interests Crist, the thing that she’s been studying and publicizing for the past three decades as a professor and radical environmental thinker, is an even deeper question: Why is so little being done to address this planetary emergency?