Global warming could destroy many of America 's wonders . Rising sea levels could make visiting New Orleans difficult in the future . Glaciers in the Alps could melt by the middle of the century . It 's happening quickly , '' he said . Encouraged by warmer temperatures , pine beetles are ruining forests in Europe .
Global warming could destroy many of America 's wonders . Rising sea levels could make visiting New Orleans difficult in the future . Glaciers in the Alps could melt by the middle of the century . Encouraged by warmer temperatures , pine beetles are ruining forests in Europe .