In reality, we haven't escaped the gravity of life at all. We are still beholden to ecological laws, the same as any other life-form.

The truth is, natural organisms have managed to do everything we want to do without guzzling fossil fuels, polluting the planet or mortgaging the future.

Life creates conditions conducive to life.

There are literally as many ideas as there are organisms.

Virtually all native cultures that have survived without fouling their nests have acknowledged that nature knows best, and have had the humility to ask the bears and wolves and ravens and redwoods for guidance.

For a long time we have thought we were better than the living world, and now some of us tend to think we are worse, that everything we touch turns to soot. But neither perspective is healthy. We have to remember how it feels to have equal standing in the world, to be "between the mountain and the ant . . . part and parcel of creations," as the Iroquois traditionalist Oren Lyons says.

When the forest and the city are functionally indistinguishable, then we know we have reached sustainability.