On a planet with 8 billion people, what’s the argument for an individual doing the right thing if it’s barely a drop in the bucket? Travis Rieder is a faculty member at the Johns Hopkins Berman Institute of Bioethics, where he directs the Master of Bioethics degree program. He joins host Krys Boyd to discuss how individuals should consider their approach to climate change, eating animals and other moral questions when one person’s actions are too small to affect change. His book is “Catastrophe Ethics: How to Choose Well in a World of Tough Choices.”