Was the heatwave of the 1930s caused by climate change?

From Committee to Unleash Prosperity.

"The temperature climbed to well over 100 in Las Vegas, Arizona, much of Texas, and New Mexico. In Phoenix, the heat wave is the worst since 1974. The New York Times had this headline linking the rising temperatures to climate change:
 

Well, of course, the climate is always changing, but our friends at the Heartland Institute published these two useful charts on U.S. heatwaves. The first shows no real pattern of more extreme heat waves in recent years – despite this year’s scorcher. Chart 2 shows the heatwave of the 1930s was at least on par with the current surge in temperatures. Was the 1930s heat blast due to “climate change” too? That heat wave during the Great Depression happened before 90 percent of the global CO2 emissions were belched into the earth’s atmosphere.

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