Destinations that were once ideal for summer travel, are now in decline due to extreme heat and other influences climate change.

Why it matters: Many of the world's natural wonders have been so significantly altered by our warming planet that it's already too late to save them.

"Message number one "The truth is, nowhere is safe," said Kate Marvel, senior climate scientist at Project Drawdown. "There's always the potential for an unpleasant surprise." (Erica Pandey, AXIOS)