Climate change activists hold placards during German Greens candidate for chancellor, Annalena Baerbock, and her co-party leader's, Robert Habeck, final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

German Greens candidate for chancellor Annalena Baerbock and her co-party leader Robert Habeck attend a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, reacts during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

German Greens candidate for chancellor Annalena Baerbock and her co-party leader Robert Habeck attend a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, speaks on stage during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, gestures as she speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Germany's candidate for Chancellor and co-leader of Germany's Alliance 90/The Greens party, Annalena Baerbock, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, gestures as he speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, speaks during a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, attends a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, attends a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

Robert Habeck, co-leader of Germany's Alliance 90/The Greens party, attends a final rally ahead of the general election, in Duesseldorf, Germany, September 24, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel, Nigerian writer Chimamanda Ngozi Adichie, Miriam Meckel and Lea Steinacker attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie pose before a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

German Chancellor Angela Merkel and Nigerian writer Chimamanda Ngozi Adichie attend a panel discussion in Dusseldorf, Germany, September 8, 2021. Rolf Vennenbernd/Pool via REUTERS

A medical worker in a school hall administers a dose of the Pfizer-BioNTech COVID-19 vaccine to a student of the Leibniz-Montessori secondary school, amid the coronavirus disease (COVID-19) pandemic, in Dusseldorf, Germany, August 27, 2021. REUTERS/Thilo Schmuelgen

A medical worker in a school hall administers a dose of the Pfizer-BioNTech COVID-19 vaccine to a student of the Leibniz-Montessori secondary school, amid the coronavirus disease (COVID-19) pandemic, in Dusseldorf, Germany, August 27, 2021. REUTERS/Thilo Schmuelgen

A medical worker in a school hall administers a dose of the Pfizer-BioNTech COVID-19 vaccine to a student of the Leibniz-Montessori secondary school, amid the coronavirus disease (COVID-19) pandemic, in Dusseldorf, Germany, August 27, 2021. REUTERS/Thilo Schmuelgen

A sign reading "Pubic vaccination point" is seen at the Leibniz-Montessori secondary school, amid the coronavirus disease (COVID-19) pandemic, in Dusseldorf, Germany, August 27, 2021. REUTERS/Thilo Schmuelgen

German Chancellor Angela Merkel returns to her seat after her speech during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Duesseldorf, Germany, August 23, 2021. Federico Gambarini/Pool via REUTERS

German Chancellor Angela Merkel and Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Duesseldorf, Germany, August 23, 2021. Federico Gambarini/Pool via REUTERS

German Chancellor Angela Merkel and Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Duesseldorf, Germany, August 23, 2021. Federico Gambarini/Pool via REUTERS

German Chancellor Angela Merkel and Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Duesseldorf, Germany, August 23, 2021. Federico Gambarini/Pool via REUTERS

German Chancellor Angela Merkel talks to British Minister of State for Trade policy Greg Hands during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel and Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel attends a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel attends a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

German Chancellor Angela Merkel speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet speaks during a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet attends a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet, the president of North Rhine-Westphalia state parliament Andre Kuper, German Chancellor Angela Merkel and Ghana's President Nana Akufo-Addo walk to attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet and German Chancellor Angela Merkel walk to attend a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler

Prime Minister of North Rhine-Westphalia and candidate for chancellor of the CDU/CSU Armin Laschet welcomes British Minister of State for Trade policy Greg Hands at a ceremony for the 75th anniversary of the German state of North Rhine-Westphalia in Dusseldorf, Germany, August 23, 2021. REUTERS/Leon Kuegeler