Making a big change in your beliefs

As a teenager, Naomi Mourra realised there was something intrinsic to her identity that meant living by the guidelines she'd been raised with would be impossible. How did Naomi navigate the choice that lay ahead of her, which she says was a matter of life or death? Plus, what led Peter Singer to focus his life on ethics and fifty years since Singer published Animal Liberation, what does he think we can all do to keep building a more sustainable world?