Which statement accurately describes the coastal protection role of coral reefs and the effect of warming oceans?

Which statement accurately describes the coastal protection role of coral reefs and the effect of warming oceans?

• A. They trap sediment reducing water clarity but warming increases coastal protection.
• B. They reflect all wave energy leading to increased protection but more biodiversity loss.
• C. They support fisheries but do not affect wave action.
• D. They dissipate wave energy and protect shorelines.

Answer: (D)

Coral reefs act as natural breakwaters: their shallow, rough, and complex structure causes incoming waves to break and lose energy before reaching the shore, which lowers wave height at the coastline and reduces erosion and storm surge. That ability to dissipate energy is the key way reefs protect shorelines. Warming oceans threaten this role because higher temperatures stress corals, leading to bleaching, reduced coral cover, and loss of the reef’s three‑dimensional structure. With degraded or dying reefs, the physical barriers become weaker, so their capacity to break up waves diminishes and coastal protection declines.

Coral reefs act as natural breakwaters: their shallow, rough, and complex structure causes incoming waves to break and lose energy before reaching the shore, which lowers wave height at the coastline and reduces erosion and storm surge. That ability to dissipate energy is the key way reefs protect shorelines.

Warming oceans threaten this role because higher temperatures stress corals, leading to bleaching, reduced coral cover, and loss of the reef’s three‑dimensional structure. With degraded or dying reefs, the physical barriers become weaker, so their capacity to break up waves diminishes and coastal protection declines.