Theme 1: Environmental Sustainable Development
Energy efficiency
Wind energy
Hydraulic energy
Solar energy
Geothermal energy resources
Hybrid energy
Photovoltaic technology
Energy materials
Energy equipment
Energy Engineering
Nuclear Energy Engineering
Wind power generation
Energy storage system
Battery and energy storage
Biomass energy 
Sustainable Energy
Energy supply conversion
Wind energy development and utilization
Biodiesel fuel
Environmental Impact Assessment
Urban energy system
Renewable energy conservation
Energy Management and Quality
Topic 2: Environmental Economics
Valuation of ecosystem services
Environmental Policy Analysis and Design
Cost benefit analysis of environmental projects
Sustainable Development and Economic Growth
Climate Change Economics
Green Energy Economics
Industrial Ecology and Circular Economy
Environmental Accounting and Reporting
Environmental Impact Assessment
Pollution Control and Regulatory Economics
natural resource management 
Behavioral Economics of Environmental Decision making
Environmental issues in developing countries
Energy economics topics related to the environment
Agricultural economics topics related to the environment
Environmental market mechanisms, such as carbon trading
Environmental Justice and Equity