Input: Renewable energy commercialization
As of 2014, the wind industry in the USA is able to produce more power at lower cost by using taller wind turbines with longer blades, capturing the faster winds at higher elevations. This has opened up new opportunities and in Indiana, Michigan, and Ohio, the price of power from wind turbines built 300 feet to 400 feet above the ground can now compete with conventional fossil fuels like coal. Prices have fallen to about 4 cents per kilowatt-hour in some cases and utilities have been increasing the amount of wind energy in their portfolio, saying it is their cheapest option.

Prices have fallen as low as what price?
Output: 4 cents per kilowatt-hour

Input: Slavs
Jordanes tells us that the Sclaveni had swamps and forests for their cities. Another 6th-century source refers to them living among nearly impenetrable forests, rivers, lakes, and marshes.

A 6th-century source refers to the Sclaveni as living where?
Output: among nearly impenetrable forests, rivers, lakes, and marshes

Input: Madonna (entertainer)
Controversy erupted when Madonna decided to adopt from Malawi again. Chifundo "Mercy" James was finally adopted in June 2009. Madonna had known Mercy from the time she went to adopt David. Mercy's grandmother had initially protested the adoption, but later gave in, saying "At first I didn't want her to go but as a family we had to sit down and reach an agreement and we agreed that Mercy should go. The men insisted that Mercy be adopted and I won't resist anymore. I still love Mercy. She is my dearest." Mercy's father was still adamant saying that he could not support the adoption since he was alive.

Who initially protested the adoption?
Output: Mercy's grandmother

Input: Detroit
In the years following the mid-1930s, Detroit was referred to as the "City of Champions" after the Tigers, Lions, and Red Wings captured all three major professional sports championships in a seven-month period of time (the Tigers won the World Series in October 1935; the Lions won the NFL championship in December 1935; the Red Wings won the Stanley Cup in April 1936). In 1932, Eddie "The Midnight Express" Tolan from Detroit won the 100- and 200-meter races and two gold medals at the 1932 Summer Olympics. Joe Louis won the heavyweight championship of the world in 1937.

What is Detroit's sports related nickname?
Output:
City of Champions