Former New Zealand Prime Minister Jacinda Ardern will help tackle violent extremism online and will also be on the board of an environmental prize set up by Prince William as she looks ahead to a life after politics. Ms Ardern stepped down as prime minister in January saying she had “no more in the tank” to lead the country and would also not seek re-election to parliament. She is due to give her final speech in parliament on Wednesday. Ms Ardern, who became the youngest female leader in the world when she won power in 2017 at the age of...