One of the highest rated restaurants in the world, Eleven Madison Park in New York City, is removing all animal products from its menu. Eleven Madison's chef says the current food system is not sustainable, and his focus will be on a world-class menu that is entirely vegan. Is this a one-off, or a harbinger of more change? Even fast food restaurants now offer meatless burgers. New York Times columnist Ezra Klein argues that vegan and vegetarian options are still harder to find and often not very