The Environment Ministry ordered targeted Han River dredging and weir adjustments before the Seoul International Marathon, citing late-summer cyanobacteria mats that raised microcystin monitoring near the Jamsil course.
Gangwon Province is seeding riparian buffers and coarse woody debris above Yongpyong-area snowmaking stream intakes after biologists flagged Korean clawed salamander habitat overlap with early-season artificial snow draws.
Petrochemical consortia tied to Ulsan refineries are funding mangrove nursery pilots on Yeongam tidal flats, testing whether restored seedlings can anchor sediment near industrial coasts without conflicting with shellfish leases.