Discussion
Consider the following statements about nature based coastal defence.
1. Vegetated foreshores attenuate wave energy measurably.
2. They can adapt to sea level rise by accreting sediment.
3. They provide protection that never requires monitoring.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are the case for nature based defence: vegetated foreshores measurably attenuate waves, and unlike a structure they can keep pace with sea level rise by trapping sediment and accreting. Statement 3 is wrong - a living system needs monitoring precisely because it changes, and it can be lost to disease, storm damage or a change in the sediment supply.
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