Marine Heat & Fish Die-Offs: Dead fish along South Korea’s east coast are being linked to a recent surge in Pacific bluefin tuna catches, with experts pointing to possible bycatch stress in set-net fisheries as warming seas reshape local ecosystems. Seoul Summer Water Fun: Seoul opens six Han River outdoor pools and water playgrounds (Ttukseom, Yeouido, Jamsil, Gwangnaru, Nanji, Yanghwa) through Aug. 30, with weather and air-quality suspensions and free summer programs for youth. Sustainable K-Food Supply: CJ Foods (Bibigo owner) plans a land-based gim (roasted seaweed) plant in Cheonan, aiming for year-round harvest as sea temperatures and demand strain ocean cultivation. Circular Materials Push: Soft plastics recycling is restarting after REDcycle’s collapse, but operators say the biggest constraint is collecting enough material; supermarkets across multiple regions now host collection points. Ocean Governance & Illegal Fishing: The Mombasa Declaration at the Our Ocean Conference backs fisheries transparency, including better vessel registries and shared data—South Korea is among signatories. Arctic Shipping Watch: Russia named a second Arctic LNG carrier tied to Northern Sea Route expansion, while sanctions have disrupted parts of the build chain.