The twentieth century has drawn to a close and humanity faces the problem of being able to support its population without inducing catastrophic and irreversible destruction on Earth’s life-support systems. Throughout time, humankind has been living as though there are no consequences to its actions. But now, as people of the future, we see what is happening to the world that we live in. Despite all we know, these easily seen problems are still being ignored. Our actions in the past determine the present, and our actions now determine the fu ....