The U2 lead singer is a long-time supporter of charity efforts and in 2005 he played a fundamental role in organising Live 8, a series of worldwide concerts which sought to raise the profile of the world's poverty problems.
Speaking to reporters recently, he said that that the ongoing violence in the Darfur region in Sudan was "preposterous" and that "governments need to take up [their] slack" in dealing with the situation.
Although he said that "the activism I do is because I can and I should", he added: "I would always rather be with the band - you know you wake up in the morning with a melody in your head - it is a thrill like no other in the world to be in this band".
He joked that if world leaders did more to tackle problems such as Darfur, "then pop stars and sports stars can stay in bed like they'd like to".
The singer took action in fighting against AIDS and poverty last Saturday in a town in Chicago.
Bono and his wife, Ali Hewson, visited the downtown Nordstrom store to promote a designer T-shirt embellished with the logo of Bono's "One" campaign against poverty, which will raise money to pay for AIDS medication and medical care in Africa.
The shirts are made in Africa by Edun, a fair trade clothing label started by Bono and Hewson.
The company will donate US$10 (£5) for every US$40 (£20) shirt sold to a fund supporting the health care of the factory workers who make the shirts.
