This book treats different themes which are intrinsically linked and of extreme significance for the entire global community such as the necessity to cut emissions and transit toward a more sustainable and green economy. The content extends to the urgency to shape a new multilateralism and reinforce cooperation to achieve global goods, where the environment comes first, to the green finance which will play a fundamental role for the green transition paying particular attention to the United Nations' 2030 Agenda for Sustainable Development.A particular emphasis is given to the so-called "Dual Circulation Strategy" (DCS) which is presently becoming the priority not only for China but also for the rest of the global community. Due to the uncertainties caused by the pandemic and other external factors, China has substituted GDP growth with the so-called six guarantees (liù bao ??) which represent the six fundamental aspects of the economy and society that according to the central government must receive priority attention, and protection in economic policy to ensure economic recovery. China also introduced the concept of an "ecological civilization" (shengtài wénmíng ????) through green, low-carbon economic development. One of the targets is to achieve carbon neutrality before 2060, though the rest of the global community and in particular the European Union with its Green Deal, and the US with its renewed climate policies, are pushing to reach this objective in 2050.In order to grant all these developments, "green finance" plays a fundamental role for the success of this green transition. Therefore, a substantial part of this book explores the many aspects surrounding this theme. Due to renewables playing a very important role in the green transition, the final part of this book explores investment opportunities related to the development of these alternative sources of energy.