Topic 1: Environment
Pollution control
Ecosystem management
Solid waste management
Environmental Management
Water resources management
Wastewater discharge management
Water quality modeling
Environmental Nanotechnology
Geographic Information Systems, Statistics, and Remote Sensing
Environmental remote sensing applications
GIS is used for environmental assessment
Wastewater and sludge treatment
Water treatment and reclamation
Industrial wastewater treatment
Wetland for wastewater treatment
Ecosystem restoration
Biological filtration of harmful gases
Soil remediation/plant remediation
Topic 2: Clean Energy
Renewable energy technologies and systems
Renewable energy storage technology
Energy efficiency
Solar thermal energy
Solar powered seawater desalination
Solar energy materials
Photovoltaic
Wind energy technology
Hydrogen energy production
Hydrogen storage
Fuel cell
Biomass and biofuels
Waste to energy conversion
Nuclear energy
Energy management
Energy Security and Clean Utilization
Energy Management Control System
Bioenergy
Passive solar building 
Sustainable architecture
Energy and Architecture
Economic feasibility of renewable energy systems, etc
Topic 3: Carbon Neutrality
Green dual carbon, carbon emission source
Carbon sequestration, carbon capture and storage
High pressure water injection
Regional carbon emissions, organizational carbon emissions
Life cycle carbon emissions
Zero carbon technology, negative carbon technology
Hydrogen Science and Engineering, Carbon Storage Science and Engineering
Low carbon technology, low-carbon agriculture, low-carbon laws, low-carbon economy
Materials Science and Engineering
Energy Internet Project
Nuclear Engineering and Nuclear Technology
Environmental Science and Engineering
Carbon screening, carbon trading, carbon sink
Carbon capture and utilization
Carbon sequestration, carbon labeling
Green transportation, carbon inclusive