When Bono took the stage at the TED2013 Conference in Long Beach, California, the U2 front man told the audience he had embraced his "inner nerd." "Exit the rock star," Bono said, "Enter the evidence-based activist - the factivist." The speech was a call to action. Extreme global poverty has already been cut in half over the past 20 years, from 43% in 1990 to 21% in 2010. Bono said that if the current trajectory can be continued, extreme poverty could be virtually eliminated by 2030.