His name was Sven Arrhenius. He was Swedish, and he said, if you double the CO2 level in the atmosphere, which he thought might -- this is in 1900 -- the temperature ought to go up about 5.5 degrees, he calculated.
他的名字是 Sven Arrhenius，瑞典人。他说， 如果大气含有两倍的二氧化碳， 他认为可能会 — 那时是 1900 年 — 温度会上升 5.5 度，他计算过，