Complete the sentences with the correct options

1. The Arctic is the place [which|where] global warming is one of the main issues.
2. The man, [whose|who] photo we see above, is a volunteer.
3. Tom decided to choose the Arctic volunteer programme, [which|that] Lora recommended to him.
4. Because of climate change animals [that|whom] live in the Arctic can die.
5. Volunteers try to struggle with the natural hazards [where|which] are caused by melting of the Greenland ice sheet.
6. Scientists, [that|who] work here, are sure that melting Arctic ice is expected to speed up sea level rise.