Why are hydroelectric dams controversial?

Answer: Disrupt ecosystems and communities

Disrupt ecosystems and communities ✓ — Correct! Dams flood large areas (destroying habitats, displacing communities), block fish migration (threatening salmon), trap sediment (eroding downstream deltas), and alter river ecosystems. While providing clean energy, dams have significant ecological costs.

Dams always break eventually — Wrong. Modern engineering makes dams safe for decades. The controversy is about environmental impact—flooding land, blocking fish migration, and changing river ecosystems.

Electricity from dams is weak — Wrong. Hydroelectric power is strong and reliable. The controversy is environmental—dams flood areas, displace communities, block fish, and alter ecosystems.