Activism
Hartnett has been involved in various philanthropic causes. In 2007, he took time out from filming to support the green lifestyle campaign of Global Cool.
In 2011, Hartnett became one of a handful of celebrities attached to USAID and Ad Council's FWD campaign, an awareness initiative tied to that year's East Africa drought. He joined Uma Thurman, Chanel Iman and Geena Davis in TV and internet ads to "forward the facts" about the crisis.
In 2012, Hartnett also joined Barack Obama in his campaign in Minnesota, appearing at such events as the Minnesota Greater Together Youth Summit before formally endorsing the President on the official campaign YouTube channel.
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