Theme1 energy efficiency nuclear energy Hydrogen storage wind power energy management fuel cell Energy saving technology Energy storage technology Energy Engineering Alternative fuels Nuclear Power Technology Hydrogen energy resources Solar thermal energy Solar energy materials renewable energy Solar energy engineering Water supply and drainage engineering Energy Chemical Engineering Hybrid energy system Clean production process Photovoltaic and wind energy technology Conversion of waste into energy Thermal and Power Engineering Thermal Engineering and Thermodynamics Environmental Science and Engineering Advanced energy technology Mechanical Automation Engineering Noise and vibration control Biomass energy engineering Energy management control system New Energy Science and Engineering Waste treatment and recycling Cultivation and Protection of Forests Renewable energy storage technology Energy security and clean utilization Energy equipment and energy management Thermal and Wind Energy Engineering Energy security and energy systems Energy conversion and energy efficiency Civil engineering and energy-efficient buildings Energy saving lighting products and technologies Building Environment and Equipment Engineering Renewable energy technologies and systems Renewable and clean energy Energy management and sustainable development Electrical Automation and Power Engineering Soil and water conservation and desertification control Hydroelectric, geothermal, and tidal power generation Theme2 Ecological economy circular economy low-carbon economy fair trade Green living clean energy Green technology Purple economy class Sustainable entrepreneurship Environment and Health Sustainable economy Corporate Social Responsibility Sustainable Development Goals Sustainable economic development Ecology and Circular Economy Ecological protection and restoration Resource protection and management Environmental planning and management Environmental Materials and Technology Sustainable urban development Sustainable Food and Agriculture Water pollution treatment and recycling Solid waste treatment and management