Distribution and Impact of Harmful Algae Blooms (HABs) in Background of Global Climate Change

Harmful algal blooms (HABs) are increasingly recognized as a critical global environmental challenge, particularly in the context of climate change. This paper synthesizes the current understanding of HABs global distribution, key environmental drivers, ecological and economic impacts, and advancements in monitoring technologies. Recent data indicate significant regional clustering of HAB events, especially in coastal regions of Europe, Asia, and North America. The study highlights how climate change exacerbates HABs through rising ocean temperatures, increased precipitation leading to nutrient runoff, and ocean acidification caused by elevated CO levels, which enhance the growth and toxicity of harmful algal species. The consequences of HABs are severe and multifaceted, including mass marine organism mortality, bioaccumulation of toxins, threats to public health via contaminated seafood, and substantial economic losses in fisheries and tourism. The paper also explores evolving monitoring methods, such as molecular diagnostics, AI-assisted remote sensing, and IoT-integrated water quality sensors. It highlights the importance of international cooperation, standardized data collection, and proactive policy development to mitigate future impacts. Overall, the study provides a comprehensive perspective on HABs in the background of growing climate change and calls for approaches to effectively manage their ecological and societal risks.