... • limited, non-renewable • harmful • exhausted Sources of energy Advantages Disadvantages Geother- mal heat - Clean and safe , inexpensive - Available only in a few places Wind - Abundant and ... Wind - Abundant and unlimited, clean and safe - Not available when there is no wind Solar energy - Plentiful , infinite , clean and safe , renewable - Influenced by the presence of clouds or pollution ... produced during nighttime Water Clean and safe , renewable - Must build dams , so expensive Nuclear energy - Unlimited , inexpensive - Very dangerous Task 3. Work in groups. Express your belief...