Identify the sentence that disrupts paragraph unity:\n'[1] Coastal mangrove reforestation shields shoreline barangays against severe typhoon storm surges. [2] These wetland ecosystems serve as critical nursery habitats for indigenous marine species. [3] Commercial deep-sea trawling requires heavy diesel fuel subsidies from international trade groups. [4] Furthermore, mature mangrove root networks effectively filter sediment runoff before it reaches coral reefs.'