The tragedy of the downfall of the USA Looking to the (so-called) natural, biological world for some sort of inspiration or grounding concerning human affairs is a traditional, if perhaps currently under-utilized, technique. It is not in itself a science, though it welcomes knowledge gained from scientific inquiry. But neither is it mere superstition or a fantastical divination like reading the future in the flight patterns and singing of birds. (Or is augery merely a lost art?).
Plants and animals have an instinct and drive to stay alive, attain some level of stasis or comfort, and reproduce. Since there is not unlimited space and resources for unlimited numbers of countless species to exist simultaneously, there is a de facto competition for the means of survival. This all may be obvious, of course, but is stated here to establish a "starting point". Given that point then, it can be said that ethics and morality exist to put the individual's wants and needs in a dynamic, working perspective with others and world. And given that point, of organisms "needing to take", and therefore taking what they need (including killing other organisms for food), one can imagine an extreme case where one species or one individual tries to take all life and land to be their property. This would eventually include genocide and slavery by all probability, which all but the coarsest and most short-sighted of ethics condemn. Which is where we humans find ourselves: in between Jainism and genocide, so to speak. Between existing on sunshine and rainbows while avoiding stepping on bugs; or attempting to be Pharaohs of the universe and owning, consuming, or destroying all.
Which leads to many questions. A few examples: What is the optimal balance of give and take for an individual? Like a person's eating habits, how much is "too much"? In what way are nations similar to individuals concerning actions, intentions, responsibility, etc. and in what ways are they different? Do nations owe each other anything? If so, what? More ambiguously, what is the real difference between countries beyond their borders? Do religions somehow transcend borders, or merely offer different ones? What of the seemingly contradictory trends toward both unification and tribal states? Given the facts of the current state of affairs, the cycles of life and nature, and evolution... how are the sustainability of individuals, nations, and the Earth interrelated?