Anote's Ark

Anote's Ark is a 2018 Canadian documentary film directed by Matthieu Rytz. Profiling the impact of climate change on the island nation of Kiribati, which will be one of the first nations on earth to entirely disappear underwater in the event of a sustained sea level rise, the film tells the stories of the nation's former president Anote Tong, who intensely lobbied the international community to take action on the threat, and of Sermary Tiare, an I-Kiribati woman who decides to protect her family by emigrating to New Zealand.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.