Four of them live in central Portugal, where
bushfires blamed in part on climate change killed more than 100 people in 2017.
The others coastal city threatened by rising sea levels.
Scientists say the man-made emission of greenhouse gases such as carbon dioxide must end by 2050 at the latest to avoid pushing global temperatures beyond the threshold of 1.5°C set out in the Paris agreement
.
the Global Legal Action Network
, an international non-profit organisation