Support WBURAre Recent Heat Waves A Result Of Climate Change?Play03:12Download AudioChristopher JoyceAugust 06, 2012 ShareCattle use a tree for shade as temperatures rose above 100 degrees in a pasture July 28, 2011, near Canadian, Texas. (Getty Images)
Cattle use a tree for shade as temperatures rose above 100 degrees in a pasture July 28, 2011, near Canadian, Texas. (Getty Images)