Not only will carbon dioxide levels be at the highest levels for 24 million years , but global average temperatures will be higher than for up to 10 million years , said chris thomas of the university of york 約克大學(xué)的克里斯托瑪斯說,不僅二氧化碳的濃度將是2 , 400萬年來最高,全球平均氣溫也將是1 , 000萬年來最高。