Ecological Consequences of Deforestation and Agricultural Intensification in North Bihar

North Bihar, located in the fertile Gangetic plains, has historically been known for its unique ecological diversity and traditional agricultural systems. However, over the last three decades, the region has undergone rapid deforestation and agricultural intensification, leading to the loss of biodiversity and severe ecological stress. This study focuses on six representative districts of North Bihar—Purnea, Katihar, Araria, Kishanganj, Darbhanga, and Supaul—to analyze the consequences of human-driven land-use change on biodiversity and ecological sustainability. By using both primary data collected through field surveys and interviews, and secondary data from government reports, environmental agencies, and satellite assessments, the paper investigates trends in forest cover loss, wetland degradation, cropping pattern shifts, chemical input use, and the decline of bird and fish diversity. The findings reveal a steady decrease in forest and wetland areas, with significant encroachment for agriculture and settlements. Monocropping systems dominated by maize, paddy, and jute have replaced traditional diverse cropping patterns, accelerating the decline of agro-biodiversity. Fertilizer and pesticide dependency has risen sharply, causing soil degradation, pest resistance, and contamination of freshwater ecosystems. Migratory birds and freshwater fish, once abundant in wetlands and rivers, have witnessed a sharp reduction in diversity. Primary surveys confirm that local communities are aware of the ecological crisis, reporting declines in soil fertility, water quality, and biodiversity. The study concludes that while intensification has improved short-term yields, the ecological costs far outweigh the benefits, threatening livelihoods, food security, and long-term resilience of the region. The research recommends community-driven afforestation, crop diversification, organic farming incentives, wetland restoration, and eco-tourism as key solutions. Without urgent interventions, North Bihar’s ecological decline may become irreversible, undermining both biodiversity and human survival.