Drawing the metaphor of the early attempts to fly. The man going off of a very high cliff in his airplane, with the wings flapping, and the guys flapping the wings and the wind is in his face, and this poor fool thinks he's flying, but, in fact, he's in free fall, and he just doesn't know it yet because the ground is so far away, but, of course, the craft is doomed to crash.
That's the way our civilization is, the very high cliff represents the virtually unlimited resources we seem to have when we began this journey. The craft isn't flying because it's not built according to the laws of aerodynamics and it's subject to the law of gravity.
Our civilization is not flying because it's not built according to the laws of aerodynamics for civilizations that would fly. And, of course, the ground is still a long way away, but some people have seen that ground rushing up sooner than the rest of us have.
The visionaries have seen it and have told us it's coming. There's not a single scientific, peer-reviewed paper published in the last 25 years that would contradict this scenario: every living system of earth is in decline, every life support system of earth is in decline, and these together constitute the biosphere, the biosphere that supports and nurtures all of life, and not just our life but perhaps 30 million other species that share this planet with us."