What is Ethics?

Ethics concerns questions about right or wrong, both in one's professional and private life. May we sacrifice one person to save many others? What is a good human being? Are there universal moral truths? In environmental and animal ethics questions about humans’ relationship to nature and the environment, for instance: Is meat eating morally defensible? Is it unethical to grow genetically modified crops? How should then interests of an endangered species of animal be treated in the planning of a new infrastructure project?