Swedish climate activist Greta Thunberg takes part in the rally ''Europe Climate Strike'' in Brussels, Belgium, March 6, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg takes part in the rally ''Europe Climate Strike'' in Brussels, Belgium, March 6, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg takes part in the rally ''Europe Climate Strike'' in Brussels, Belgium, March 6, 2020. REUTERS/Johanna Geron

Demonstrators take part in the rally ''Europe Climate Strike'' in Brussels, Belgium, March 6, 2020. REUTERS/Johanna Geron

Demonstrators hold placards as they take part in the rally ''Europe Climate Strike'' in Brussels, Belgium, March 6, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg is welcomed by European Parliament President David Sassoli in Brussels, Belgium, March 4, 2020. REUTERS/Yves Herman

Swedish climate activist Greta Thunberg addresses the environment committee at the European Parliament in Brussels, Belgium, March 4, 2020. REUTERS/Yves Herman

Swedish climate activist Greta Thunberg, European Commission President Ursula Von der Leyen and European Commission Vice-President Frans Timmermans arrive to attend a meeting with European Commissioners at the European Commission in Brussels, Belgium, March 4, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg addresses the environment committee at the European Parliament in Brussels, Belgium, March 4, 2020. REUTERS/Yves Herman

Swedish climate activist Greta Thunberg looks on as she attends the environment committee at the European Parliament in Brussels, Belgium, March 4, 2020. REUTERS/Yves Herman

Swedish climate activist Greta Thunberg looks on as she attends the environment committee at the European Parliament in Brussels, Belgium, March 4, 2020. REUTERS/Yves Herman

European Commission President Ursula Von der Leyen reacts as she attends a meeting with Swedish climate activist Greta Thunberg and European Commissioners at the European Commission in Brussels, Belgium, March 4, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg is seen before the meeting with EU environment ministers in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg arrives for the meeting with EU environment ministers in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg looks on before the meeting with EU environment ministers in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg takes part in a protest outside the EU Council as EU environment ministers meet in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg takes part in a protest outside the EU Council as EU environment ministers meet in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron

Swedish climate activist Greta Thunberg takes part in a protest outside the EU Council as EU environment ministers meet in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron TPX IMAGES OF THE DAY

Swedish climate activist Greta Thunberg takes part in a protest outside the EU Council as EU environment ministers meet in Brussels, Belgium, March 5, 2020. REUTERS/Johanna Geron