Climate Change Impacts and Strategic Solutions: Addressing Water and Ecological Challenges in Bangladesh

Bangladesh, one of the most climate-vulnerable countries in the world, faces significant environmental threats due to its low-lying topography, high population density, and geographical location. Climate change exacerbates challenges such as rising temperatures, erratic rainfall, increased flood frequencies, sea-level rise, riverbank erosion, and degradation of water resources. Between 1990 and 2020, the mean annual temperature increased by approximately 0.19 °C per decade, while rainfall variability intensified, with extreme precipitation events rising by 35%. Flood frequency in the Ganges-Brahmaputra-Meghna basin increased by 21%, with 1-in-20-year floods now occurring every 4–7 years. Coastal salinity intrusion expanded inland by up to 120 kilometers, severely impacting agriculture and freshwater access. Eutrophication-driven harmful algal blooms, triggered by increased nutrient loading from agriculture and poor wastewater management, have increased in frequency by 42%, particularly during the dry season. This paper investigates these interconnected effects of climate change on Bangladesh’s river dynamics and water bodies using hydrological modeling and long-term observational data. It evaluates adaptive and mitigative strategies, including ecological restoration, renewable energy adoption, and sustainable land management. Emphasizing the need for data-driven policy frameworks, the study offers practical recommendations to reduce nutrient pollution, enhance agricultural resilience, and manage water resources sustainably, thereby improving long-term climate resilience in Bangladesh.