Climate change is the defining issue of our time. We, as a people, face an unprecedented environmental challenge to change how we produce and use energy. This presents an economic opportunity as we pivot toward a low-carbon future. Answering climate change could be the greatest economic opportunity in world history. The climate economy includes key sectors such as clean energy development, thermal and electrical efficiencies, sustainable transportation systems, working lands, smart growth development, and many more. The climate economy is the economy of the future.