You will refine your thesis statement to include one philosophical (Utilitarianism, Deontology, Virtue Ethics) and one environmental (Land Ethic, Deep Ecology, Biocentrism, etc) ethical theory, so you can start thinking about which theories you can leverage to make your argument. Choose your two theories carefully, because they will contribute substantially to your argument.
Once you’ve singled out two theories, you’ll update your thesis statement to show how both can be incorporated in your argument. Finally, you’ll report on your research. And your thesis statement should make it clear which theories you will be used to examine your topic