Greece’s remote islands are becoming a warning sign of Europe’s population decline, as falling birth rates and youth migration threaten schools and local communities KALAMOS, Greece — Chryssa Ntalaka’s classroom has become an object lesson in subtraction. Key points and original sources are listed below.

• Greece’s remote islands are becoming a warning sign of Europe’s population decline, as falling birth rates and youth migration threaten schools and local communitiesS1

• KALAMOS, Greece — Chryssa Ntalaka’s classroom has become an object lesson in subtraction. The sole teacher in the last schoolS2