“People make reality. Hydroelectric dams. Undersea tunnels. Supersonic transport. Tough to stand against that.”

Watchman smiles, tired. “We don’t make reality. We just evade it. So far. By looting natural capital and hiding the costs. But the bill is coming, and we won’t be able to pay.”

Adam can’t decide whether to smile or nod. He knows only that these people—the tiny few immune to consensual reality—have a secret he needs to understand.

Maidenhair inspects Adam, as through a lab’s two-way mirror. “Can I ask you something else?”

“Anything you want.”

“It’s a simple question. How long do you think we have?”

He doesn’t understand. He looks to Watchman, but the man, too, is waiting for his answer. “I don’t know.”

“In your heart of hearts. How long, before we pull the place down around us?”

Her words embarrass Adam. It’s a question for undergrad dorms. For barrooms late on a Saturday night. He has let the situation get away from him, and none of this—the trespass through private land, the ascent, this fuzzy conversation—can be worth the two extra data points. He looks away, out on the ravaged redwoods. “Really. I don’t know.”

“Do you believe human beings are using resources faster than the world can replace them?”

The question seems so far beyond calculation it’s meaningless. Then some small jam in him dislodges, and it’s like an unblinding. “Yes.”

“Thank you!” She’s pleased with her overgrown pupil. He grins back. Maidenhair’s head bobs forward and her eyebrows flare. “And would you say that the rate is falling or rising?”

He has seen the graphs. Everyone has. Ignition has only just started.

“It’s so simple,” she says. “So obvious. Exponential growth inside a finite system leads to collapse. But people don’t see it. So the authority of people is bankrupt.” Maidenhair fixes him with a look between interest and pity. Adam just wants the cradle to stop rocking. “Is the house on fire?”

A shrug. A sideways pull of the lips. “Yes.”

“And you want to observe the handful of people who’re screaming, Put it out, when everyone else is happy watching things burn.”

A minute ago, this woman was the subject of Adam’s observational study. Now he wants to confide in her. “It has a name. We call it the bystander effect. I once let my professor die because no one else in the lecture hall stood up. The larger the group . . .”

“. . . the harder it is to cry, Fire?”

“Because if there were a real problem, surely someone—”

“—lots of people would already have—”

“—with six billion other—”

“Six? Try seven. Fifteen, in a few years. We’ll soon be eating two-thirds of the planet’s net productivity. Demand for wood has tripled in our lifetime.”