The rapid warming of oceans is causing widespread ecological and societal impacts. Marine heatwaves are damaging ecosystems, while rising sea levels threaten coastal communities. Ocean acidification, which has increased by 17% since 1985, is harming marine life, including corals and shellfish. Vulnerable regions like the Arctic and small island states face heightened risks, including habitat loss and intensified storms. The report underscores the urgent need for global action to mitigate these changes and protect marine ecosystems.