Climate change presents the human race with profound choices that go beyond the current debate over new technologies, economic, and social costs and even concerns over environmental impacts. UN Secretary General Ban Ki-moon has called climate change the “moral imperative and the defining issue of our era.” Increasingly, climate change is being viewed as an ethical issue and a matter of justice. And, said the Secretary General, “We have an ethical obligation to right this injustice. We have a duty to protect the most vulnerable