Try to pin this one on solar cycles or conspiracy theories. A wide range of 
scientists note the high temps in the US. (see link below) The back story
includes a meagre corn crop for the US, with implications for food prices 
globally. 

It must be heat stress that leads me to link the most recent mass murder
in the US to their distorted gun and military economy/culture. But why do 
I meet so many Americans that agree? The would like to see the money spent
on addressing infrastructure and climate change mitigation.

They are fellow travellers on a cruise of the eastern Mediterranean, where 
temperatures in Athens hit 40C, far too much to stimulate appreciation of their 
wondrous cultural heritage. Too hot and too little wifi to add pics, maybe next
time. 
Prediction: within 10 years tourism in Europe will be impacted by climate 
change, adding to the turmoil. I won't be back in the summer months. I've
 been chasing Caravaggio paintings with great pleasure around Italy and Malta. 

While I was off on my quest my spouse got caught up inadvertently in a brawl 
in a Naples cafe between an African bag seller and his Neapolitan supplier. result: 
broken eyeglasses and a surprised spouse, no more wifi for him that day. 

What a great combination: desperate economic refugees plus the Comorra. 
Imagine what climate change will bring to that mix? Why do you think 
they are flowing out of Africa anyway?

to the point:
  U.S. EXPERIENCES WARM AND DRY JUNE; DROUGHT EXPANDS TO 56% OF LOWER 48
The average temperature for the contiguous U.S. during June was 71.2°F,
2.0°F above the 20th century average, ranking as the 14th warmest June on
record. Scorching temperatures during the second half of the month broke or tied
over 170 all-time temperature records in cities across America. June temperatures
also contributed to a record-warm first half of the year and the warmest 12-month
period the nation has experienced since recordkeeping began in 1895.
-- full story > http://www.sciencedaily.com/releases/2012/07/120720205544.htm