Various: First the couple bought a Toyota Prius hybrid car — then a 50-foot-tall backyard wind turbine. Husband and wife Tom Skadow and Kim Hagemann figure it will take 20 to 25 years for their $14,000 Skystream to pay for itself, based on current utility rates. But that’s not the point. It’s a statement, a call to action to fellow Iowans. Little by little, the couple said, they are doing their part to reduce humans’ carbon footprint on the planet — green-speak for using energy …