So if you focus in on this trajectory and these graphs, the yellow circle there highlights that the departure from the red four-degree pathway to the two-degree green pathway is immediate.
所以如果你仔细看图表中的这些轨迹， 这个黄色的圈标注出了 红色的4℃路径 和绿色2℃路径的分叉点已经迫在眉睫。