justaevolvedchimp1784156428

The 800,000-year timeline is what makes you stop. Long before humans built the first city, and before we even left Africa, the air never looked like this. Ice cores drilled thousands of feet into the Antarctic trap tiny bubbles of ancient atmosphere. The record is clear. For eight thousand centuries, atmospheric carbon dioxide hovered safely below 300 parts per million. Then industrialisation arrived. Today we are past 430 ppm. It is not exactly that the levels are high. It is how incredibly fast the spike happened. Our baseline took millennia to build and a single century to shatter. The physics of heavy, trapped heat do not care about debate. The math is simple. The consequences reverse the map.