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.
O nome dele é Sven Arrhenius. Um Sueco, que disse, que se dobrarmos o nível de CO2 na atmosfera, o que desconfiava que poderia acontecer -- isso em 1900 -- a temperatura subiria cerca de 3 graus celsius, ele calculou.