Most of the negativity that comes Hayden Christensen's way can be attributed to a decision he made in his career as an actor - he accepted the part of Anakin Skywalker in the 'Star Wars' prequels of the early 21st century. People hated those films, they hated the character, and they hated Christensen for his part in the whole sorry affair. That's not very fair to Christensen, who was simply a man doing his job. His greater crime might be that he wasn't all that good at acting - a pastime he's since mostly retired from.
Now he isn't acting so much, Christensen is able to devote more time to his environmental interests. He bought a farm in 2007 and learned how to run every aspect of it, from tending to the livestock to planting crops. As with many high-profile celebrities, he doesn't keep all of his time or his money for himself either. He's worked with the charity RED to promote awareness and fundraising efforts in an effort to combat the AIDS epidemic in Africa.