30. Dilma Rousseff

Title: President of Brazil

Country: Brazil

Age: 67

Dilma Rousseff, Brazil's first female president, leads the largest country in Latin America and the seventh-largest economy in the world. Rousseff is credited with nearly eradicating extreme poverty in Brazil during her first term by raising the monthly stipend for struggling families.

But Rousseff has hit a rough patch lately, and it appears to be getting worse. Protests broke out and gained traction in March in part because of Brazil's crumbling economy. The country's growth has plummeted — low commodity prices, high interest rates, and austerity measures are partly to blame — and it officially entered a recession in 2015. The value of its currency dropped by 45% this year through mid-November. 

Also contributing to her near record-low approval rating: A group of high-profile lawyers filed for the impeachment of Rousseff in October in connection to the corruption scandal involving the state-run oil company Petrobras (Rousseff has maintained her innocence).