Environmental ethics emerged as a new subfield of philosophy in the 1970s to challenge anthropocentrism and provide justification for environmental protection. It considers humanity's ethical obligations toward the natural world and addresses issues like pollution, resource depletion, and species extinction. There are several approaches within environmental ethics like utilitarianism, which focuses on outcomes, and biocentrism, which attributes intrinsic value to all life. Major issues debated include sustainability, environmental justice, animal rights, and balancing human needs with nature conservation.