The article concerns the problems of fight against Climate Change and Global Warming. Decarbonization of energy industry is necessary condition for reducing greenhouse gas emissions. Development of renewable energy sources, such as sun, wind, water (except for large hydroelectric power plants), geothermal springs, biofuels is limited by specific problems. Paris climate agreement, accepted by Russia in 2016, implies the necessity to reduce emissions by 25-30% of 1990 levels to 2030. This process is impossible without the nuclear energy development. The purpose of the article is to consider the potential of nuclear energy in solving the problems of climate change. The article is based on complex and system theoretical method and contains review and analysis of scientific conferences thesis, devoted to key-problems of nuclear energy industry in Russia and world, materials of reports of UNECE and UNSC, articles published in scientific journals. The most key advantages and disadvantages of nulear energy generation in terms of modern ecological problems are determined in the article to define the opportunities of nuclear energy integration to the system of “green” economy. The assumptions and forecasts of further development of modern energy industry are reflected in the conclusions of the article.