It can be so easy to become demoralized or even apocalyptic about the state of our planet. But entrepreneur and activist Paul Hawken believes we have less reason to despair than we think. In fact, Hawken asserts that if we act together, we can end the climate crisis in decades to come. In his new book, "Regeneration: Ending the Climate Crisis in One Generation," Hawken offers a model of climate activism that puts life at the center of every act and decision. After all,...