4 - Energy

4.2 - Energy production, transmission and conversion

• 4.2.6 - Hydrogen production
• 4.2.10 - Furnace and boiler technologies
• 4.2.13 - Fuel cells

4.3 - Fossil Energy Sources

• 4.3.1 - Gaseous fossil fuel
• 4.3.2 - Solid fossil fuel
• 4.3.3 - Liquid fossil fuel

4.5 - Renewable Sources of Energy

• 4.5.5 - Solid biomass
• 4.5.6 - Waste incineration
• 4.5.8 - Waste to energy other
• 4.5.11 - Liquid biofuels

4.6 - Rational use of energy

• 4.6.2 - Thermal insulation
• 4.6.5 - Process optimisation, waste heat utilisation

4.7 - Other Energy Topics

• 4.7.1 - Combustion, Flames
• 4.7.3 - Micro- and Nanotechnology related to energy

4.8 - Energy Efficiency

4.9 - Carbon capture and energy

5 - Physical and exact sciences

5.4 - Separation Technologies

• 5.4.1 - Filtration and Membrane Processes

10 - Protecting man and the environment

10.2 - Environment

• 10.2.8 - Capture and Storage of CO2