This book studies smart green innovation through the prism of social entrepreneurship as a driver for sustainable development and the development of an environmental economy. It systematizes and analyzes the modern challenges of the environmental economy: climate change and environmental pollution. The tendencies and scenarios for the environmental economy are considered in the context of implementing the Sustainable Development Goals. Globalization and international trade are also considered factors in the sustainable development of the environmental economy. The book hones in on the international experience of ecological responsibility and fighting climate change through social entrepreneurship. The contribution of corporate responsibility in the fight against climate change is determined, and state regulation of corporate responsibility in the resource-based economies of developing countries is considered. The market mechanisms for stimulating the fight against climate change through social entrepreneurship in countries with developed environmental economies are also considered. The advantages of digitalization for fighting climate change through social entrepreneurship are offered. The book also reflects on the possibilities for the sustainable development of the environmental economy based on climate-smart innovation in social entrepreneurship. It presents a model of climate-smart enterprise and substantiates its advantages for corporate responsibility and sustainable development. The key climate-smart innovations in social entrepreneurship for sustainable development of the environmental economy-robots big data, AI, blockchain, and green finance-are determined. The book also develops policy recommendations to support climate-smart innovation in social entrepreneurship.