Step 2: Evaluate each option provided in the question. The first option suggests mangrove forests were considered dangerous and untouched, which does not align with the idea of degradation. The second option implies they were seen as unproductive wastelands, leading to their conversion for agriculture and development, which directly relates to degradation. The third option states they were highly valued for biodiversity, which would lead to protection rather than degradation. The fourth option mentions their role in coastal protection, which also suggests conservation rather than degradation.