<p>The fighting in northeastern Congo has created "the worst humanitarian crisis on the planet," Jessica Lange said Tuesday. The actress spent a week in the volatile area last month as a goodwill ambassador for the United Nations Children's Fund. The five-year civil war in Congo has all but ended, but fighting between the Hema and Lendu tribes, a disastrous byproduct of the conflict, continues throughout much of resource-rich Ituri province.</p>