Noah is a kind of new Adam. Noah's sacrifices seem to be part of this new relationship between man and God. There is to be a new sociality among men, an ordered self-restraint, a divinely given responsibility for others. There's a sense in which justice is bloody but necessary. While man is given a qualified license to eat the animals, he is given an absolute responsibility for human justice.
Justice is to be by community.
Man's dignity comes out of the imago Dei . We see a respect for man as corporeal as well as for man as spiritual. Man becomes God's agent of justice, a kind of partner of God. This increases our ability to be responsible, and is related to our ability to be in covenant. This is God's unilateral pledge to have mercy in the face of justice.