The "Three Gorges Dam" is the world’s largest hydropower project — a 2.3 km long, 181 m high concrete gravity dam on China’s Yangtze River. Built between 1994 and 2006 (full power in 2012), it holds back a reservoir stretching ~600+ km. It has 22,500 MW installed capacity and generates roughly 90-100+ TWh of electricity per year on average. What it actually delivered - Massive clean electricity that reduced some coal use. - Improved navigation — big ships can now travel much farther inland, cutting transport costs inside China. - Flood control that has worked during several major events, protecting downstream areas in those specific cases. - A huge engineering flex that boosted China’s image and industrial capacity. These benefits are real. The dam produces renewable power at scale and moves goods more efficiently on the river. The real costs (the part often downplayed) Over 1.3 million people were forcibly relocated. Many lost farmland, homes, and communities. Compensation was frequently inadequate or corrupt; plenty ended up worse off economically and socially. This was not a gentle process — it was state-forced displacement on a massive scale. The local environment took a permanent hit: - The baiji (Yangtze river dolphin) is functionally extinct. - Fish stocks collapsed in the affected stretch. - The reservoir created stagnant water that increased pollution and algae issues in places. - Landslides increased around the new lake. - Small earthquakes became more frequent due to the weight of the water (induced seismicity). - Silt now builds up behind the dam instead of flowing downstream, worsening erosion and riverbed changes further along. These are documented effects, not speculation. The unique Three Gorges ecosystem was sacrificed. If the dam had never been built China would have faced more frequent and severe floods in some years — the Yangtze has a deadly history of them. That’s a legitimate downside. However: - Over a million people would have stayed in their homes and kept their land. - The river would not have been turned into this giant, altered reservoir with its specific ecological damage. - China would have relied more on coal (or other sources) for power in the early years, increasing local air pollution and global emissions somewhat. - Inland shipping would have stayed slower and costlier. The dam was a deliberate choice by Chinese leadership to prioritize rapid development, flood risk reduction, and control over nature. They accepted the human and ecological price tag. Economy and global supply chains The dam helped keep some Chinese manufacturing and transport costs lower, which indirectly supported cheaper exports to the rest of the world. Navigation improvements were meaningful for domestic trade. But this is secondary. China would still dominate global manufacturing without this one project. Worldwide supply chain impacts from the dam’s existence (or absence) are modest compared to trade policies, pandemics, or geopolitics. The main winners were Chinese industry and the state. Global consumers got slightly cheaper goods as a byproduct. The “shifting/cracking” and Earth rotation claims — fact-checked The dam is not falling apart or dangerously shifting. There are normal hairline cracks in any structure this size. During extreme 2020 floods, some outer/peripheral parts deformed slightly under pressure — this was publicly acknowledged by operators and is considered within safe limits. It is monitored. Viral videos claiming imminent collapse are exaggerated clickbait. (Current aerial view of the dam and reservoir + 1987 vs 2006 satellite comparison showing the scale of change.)