Crossing the Threshold is a carefully considered, insightful narrative that should interest anyone and everyone who cares about the future of spaceflight.

-Homer Hickam
Author of Rocket Boys/October Sky

Paul Wieland knows space from the bottom-up…and offers a fresh and valuable perspective.

-Norm Augustine
Author of Augustines Laws, former president of the American Institute of Aeronautics and Astronautics, former CEO of Lockheed Martin Corporation

Four decades after Apollo 11 landed on the moon, we seek clean energy sources, a healthy environment, and a peaceful world. To achieve these goals we must implement new approaches. "Business as usual" is no longer acceptable. Energy and resources are limited on the Earth and acquiring them adversely impacts the environment. In space, however, they are present in abundance and can be acquired without damaging ecosystems. Crossing the Threshold: Advancing into Space to Benefit the Earth shows how we can achieve a secure, sustainable future—with abundant energy, resources, and opportunities for all to have more fulfilling lives.