กังหันลมขนาดจิ๋วทางเลือกใหม่สำหรับคนเมือง

When you think of wind energy, you tend to think of the massive constructs that dot hilly landscapes or the ocean horizon. But two researchers see a future where it's as common for wind turbines to show up in backyards and on rooftops and balconies. VOA's Kevin Enochs reports.