Northern Hemisphere summer was hottest on record, scientists say - NBC News

1. Northern Hemisphere summer was hottest on record, scientists say  NBC News
2. Northern Hemisphere endures its hottest summer on record  CNN
3. This Summer Was Hottest on Record in Northern Hemisphere  The Daily Beast
4. Northern hemisphere breaks record for hottest ever summer  The Guardian
5. Northern Hemisphere sees its hottest summer on record | TheHill  The Hill
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