Here is the best article I could find on this.

The Greens' surge in popularity comes after the party on Monday named co-chair Annalena Baerbock, 40, as its first candidate for chancellor. The nomination of Ms Baerbock, a centrist who advocates a greener economy and a tougher foreign policy stance on Russia and China, has been widely praised.

Hopefully the Christian Democrat Union won't be on top any more.