- killing off the plants.
灭绝植物 - Without their roots to bind the soil together...
没有了根来固定土壤 - entire ecosystems were washed away.
整个生态系统被冲走 - And yet, there was something even more destructive in the air.
然而空气中 还有一种更具破坏性的东西 - A silent killer.
一位隐形杀手 - Carbon dioxide.
二氧化碳 - The volcanoes released
火山释放出的二氧化碳