What is the "violence" (Gen 6:11) that prompted God to bring on the Great Flood during the time of Noah?

In Gen 6:11, the narrator says, "The earth was filled with violence." It is this "violence" that moves God to plan the Great Flood. The 2014 movie, "Noah," dramatizes this violence. First, in the urban debris (trash) that pollutes the earth and the rivers. Second, the city dwellers are killing and eating animals and birds. Meanwhile, Noah and his family strive to safeguard the natural environment and they are vegans. To what degree does the film's portrait of "violence" find confirmation in the text of Genesis? To what degree are the movie makers distorting Genesis in order to falsely portray God and Noah as advocates of a "green agenda"?