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Disaster (Ice Age) Nearing the end of the Biglian Period the globe began to warm enough to start melt the polar glaciers. This influx of freshwater was enough to stop the ocean currents. This meant the nutrients needed to feed the species in the sunlight zone, shallows, coasts, bays and seas. This caused a mass extinction that left those biomes barren. Without the ocean currents the glaciers could then increase in size due to lack of warm water keeping them back. This eventually caused the extinction of all tropical biomes, lower sea level and other biomes such as isolated island to become engulfed in the advancing glaciers. The ocean currents have returned but not enough to cause the temperature to return to it previous state. However it will bring much needed nutrients back to the marine surface biomes.