A decade ago, environmentalist Hunter Lovins published Natural Capitalism. The book influenced some business leaders to embrace what was a counterintuitive notion: that going green could be a way to save or make lots of money. Since then, she has gone on to establish Natural Capitalism Solutions, a Colorado-based firm that helps businesses and governments become more energy-efficient and better prepared for the global threats of climate change. She recently wrote Climate Capitalism that presents the climate crisis as a giant business opportunity.