These curves for global temperature, atmospheric CO2 and sea level were derived from ocean cores and Antarctic ice cores, from ocean sediments and snowflakes that piled up year after year over 800,000 years forming a two-mile thick ice sheet.
这些全球温度的曲线， 大气层二氧化碳和海平面的曲线， 是通过测量海洋芯、南极冰芯、 和海洋沉淀物和雪花得到的。 80多万年来， 这些沉淀物和雪花不断积累，