T4: energy

• Fossil fuels such as oil, coal and natural gases are chemical, non-renewable, and are used for transport, heating, and electricity generation.
• The disadvantage of fossil fuels is that they release CO2, which causes global warming.
• Nuclear fuels are nuclear, non-renewable, and are used for electricity generation.
• The disadvantage of nuclear fuels is that they produce radioactive waste which needs to be disposed of safely.
• Biofuels are chemical, renewable, and are used for transport, heating, and electricity generation.
• The advantage of biofuels is that they are 'carbon neutral', meaning they have little or no effect on the environment.
• The disadvantage of biofuels is that they can take up land that could be used for farming.
• Wind energy is kinetic, renewable, and is used for electricity generation.
• The disadvantage of wind energy is that it takes up large areas that could be used for farming.
• Windmills can change the landscape.
• Hydroelectricity is gravitational potential, renewable, and is used for electricity generation.
• The disadvantage of hydroelectricity is that it can affect local habitats due to the large areas that need to be flooded to build dams.
• Geothermal energy is internal (thermal), renewable, and is used for electricity generation and heating.
• The disadvantage of geothermal energy is that it is very low.
• Tides are kinetic, renewable, and have the potential for very high electricity generation, but are hard to harness.
• Tidal barrages can block sewage which needs to go out to sea.
• Local habitats are also affected by tidal energy.
• Sun energy is nuclear, renewable, and can be used for electricity generation and heating, but is dependent on the weather and only available during daylight.
• Water waves are kinetic, renewable, and can be used for electricity generation, but have a very low potential.