Whether we need to save other species to save ourselves is not really the point. Each time a species vanishes, the planet becomes a poorer place. It doesn’t matter if we’ve never seen them, if they go extinct without our ever knowing they were here. To live is to participate in the carnival of nature, and the carnival is diminished by the losses.-- says Olivia Judson in Musings Inspired By a Quagga.
The metaphor of nature [life] as carnival may appeal to quite a few. To others, nature is a university, a cathedral, an abyss, an abattoir, a three and half billion year furnace, an obstacle to rise above and a tool kit.
If there is a truth for humans, it may be that biodiversity sustains life and nourishes culture and spirit; it may be a path to a pearl of great price.