1 Subjects: “...existential verb form habemos...”

2 Subjects: “...existential opportunity and threat...”

3

4

5 “...Climate change is unarguably a critical existential threat to humanity in the 21st century...”

6 “... offer proactive measures for coping with existential crises for humanity, such as climate change...”

7 “... of climate change and face an existential crisis. Islands are, however, potential "hubs of innovation...”