In early May, Chicagoans driving the inbound Eisenhower Expressway saw a digital billboard comparing people who believe in manmade global warming to Ted Kaczynski. Next to a photo of the Unabomber, the sign reads: “I still believe in global warming. Do you?” Bannering the bottom of the ad is the Heartland Institute’s website address. The billboard was paid for and created by the 28-year-old Chicago-based nonprofit...
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