The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The kind of peace that I think humanity might need to come with nature according to "The Nightingale and Glow-Worm poem" is the following.
The peace that is needed is the kind of peace that practice respect and tolerance for all the creatures on planet earth. According to the author -William Cowper- no creature is better or more important to the eyes of god because everything is his creation.
And this behavior is fundamental, a priority I would say, to take care of the planet showing respect to the environment and protecting mother nature. We have to stop water pollution, air pollution, noise pollution, and all types of pollution that harm the environment and the creatures on planet earth because every single one of them has a purpose in God's plans.