Group number 1: Oil
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: resources are limited, extraction and transformation can harm the environment, pollution (burning oil releases carbon dioxide).
Here you have some ideas to criticize other sources of energy:
Disadvantages of eolic energy: wind is intermittent and inconsistent, difficult to store, requires large areas.
Disadvantages of hydroelectricity: high transportation costs, dependent on weather conditions.
 
Group 2: Coal
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: extraction can be dangerous, pollution because combustion produces carbon dioxide emissions.
Here you have some ideas to criticize other source of energy:
Disadvantages of solar energy: availability affected by latitude, seasons, cloudiness, etc.
Disadvantages of uranium: generate highly contaminating nuclear waste.
 
Group 3: Natural gas.
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: very toxic, pollution (combustion releases carbon dioxide), leaks can cause explosions .
Here you have some ideas to criticize other sources of energy:
Disadvantages of biomass energy: large volume makes handling and transportation difficult.
Disadvantages of coal: pollution (combustion produces carbon dioxide emissions).
 
Group 4: Uranium
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: generate highly contaminating nuclear wastes, an accident can release dangerous radioactive substances.
Here you have some ideas to criticize other sources of energy:
Disadvantages of eolic energy: wind turbines are load, interferes with radars, televisions and radio, danger to birds.
Disadvantages of solar energy: requires large area to collect.
   
Group 5: Hydrolectricity
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: high transportation costs, dependent on weather conditions, negative environment impact, risk of dam breakage and potential flooding.
Here you have some ideas to criticize other sources of energy:
Disadvantages of biomass energy: low efficiency.

Group 6: Solar energy.
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: requires large area to collect, availability affected by latitude, seasons, cloudiness, etc. 
Here you have some ideas to criticize other sources of energy:
Disadvantages of hydroelectricity: negative environment impact, risk of dam breakage and potential flooding.
Disadvantages of coal: extraction can be dangerous.
 
Group 7: Eolic energy
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: wind is intermittent and inconsistent, difficult to store, requires large areas, wind turbines are load, interferes with radars, televisions and radio, danger to birds.
Here you have some ideas to criticize other sources of energy:
Disadvantages of oil: resources are limited, extraction and transformation can harm the environment.
Disadvantages of uranium: an accident can release dangerous radioactive substances.
 
Group 8: Biomass energy
Think of the best of your source of energy. You can look for on the Internet. Make a list.
Be ready to refute these ideas: low efficiency, large volume makes handling and transportation difficult.
Here you have some ideas to criticize other sources of energy:
Disadvantages of natural gas: leaks can cause explosions.
Disadvantages of oil: pollution (burning oil releases carbon dioxide).