Topic 1: Carbon Cycle
Carbon fixation
Carbon Release
Photosynthesis
Respiratory function
Decomposition effect
Fuel combustion
Land use 
Carbon sink
Refuse classification
Green travel, etc
Topic 2: Ecological and Environmental Protection
Environmental remediation
Carbon Neutrality
Carbon peak
Residual temperature collection
Energy efficiency 
Low carbon technology
Waste recycling and utilization
Comprehensive utilization of resources
Environmental science
Resource integration
Green lighting
Circulatory system
Topic Three: Clean Energy
Renewable energy technologies and systems
Renewable energy storage technology
Energy efficiency 
Solar thermal energy
Solar powered seawater desalination
Solar Materials
Photovoltaic and 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