In the summer, when temperatures can exceed 100 degrees F in many locations, it is important that the RVP of gasoline is well below 14.7 psi.

FORBES: Why Spring Means Higher Gasoline Prices

Greenland's surface layer vaulted into the news in summer 2012 when higher than normal temperatures caused surface melting across about 97 percent of the ice sheet.

ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)

The problem could hardly have come at a worse time, as this is the middle of the Chilean summer, when temperatures regularly top 30C (86F), our correspondent adds.

BBC: Chile water shortage hits Santiago from Maipo river

On average Baghdadis receive eight to 12 hours of national electricity a day, which makes life in the summer -- when temperatures easily reach 120 degrees -- almost unbearable.

CNN: War-scarred Baghdad places little faith in U.S. election

Getting to the same pools may mean the difference of surviving a summer when flows drop and temperatures climb.

CNN: Migrating fish get help in uphill battle

During peak cruise season, when summer temperatures and crowds at popular sites swell, it can be difficult to appreciate the magic this city offers.

BBC: Cruise ports of call: The Mediterranean for couples