June was the hottest ever in NOAA's climate record: Earth's average global temperature in June was 1.89 degrees above average, making it the hottest June in the 174-years global climate record. Here's a few global signs that the heat the United States is experiencing this summer is something much more significant than just a heat wave. "The more we warm, the easier it becomes to hit previously inconceivable levels of heat." It actually is that hot: "This year we’re stair-stepping upward due to human-caused climate change," Swain said. "I know a lot of people are freaking out right now," he said. This does not appear to be a sudden, sustained acceleration of the long-term trends climate scientists have been noting for decades. The good news: He doesn't believe Earth has reached some sort of climate tipping point and there's no hope. At this point, there aren’t any unprecedentedly extreme heat events on Earth that haven’t been exacerbated by climate change.” “But we’re starting to see the long-term, human-caused warming signal overwhelming that volatility. Natural variability still exists, said Daniel Swain, a climate scientist a the University of California, Los Angeles. Here's what to know: How do we know climate change is fueling this heat? Couldn't it be just a hot summer? 
The extreme temperatures being recorded this summer are the result of the combination of natural variations within the climate system and human-caused climate change, with a hefty serving of El Niño thrown in. It's not your imagination: This is not a typical summer. Phoenix recorded an unprecedented nineteen consecutive days over 110 degrees. Record-breaking temperatures are hitting multiple cities.
But this summer is different in some profound ways.
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