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Meteorologists say last month was the hottest June in modern history. In practical terms, this marks the 14th consecutive month that global heat records have been broken. Professor Andrew Dessler is a climate scientist at Texas A&M University. He explained that there are different factors contributing to this temperature rise. (Picture: children cool off at a water park on a hot summer day in Los Angeles, California; Credits: Frederic J. Brown/AFP/Getty Images)