What main problem related to climate change does the

author discuss in this excerpt?

the rise of temperatures in costal areas

the loss of beaches in coastal areas

the loss of homes in coastal areas

the rise of sea levels in coastal areas

The rise of sea levels in coastal areas.

Explanation:

One of the major problems of climate change - especially for low countries boarding to the sea - is the rise of sea level. Several islands have already suffered the consequenses, like loss of homes and/or beaches in coastal areas. The rise of temperatures in coastal areas is a cause for worry but it doesn't (yet) physically affect people living in coastal areas.