Meat-loving Jimmy Doherty attempts to go vegan for a week in the USA. While he's there, he sees if there's a solution to carbon emissions from belching cows. Plus, Matt Tebbutt sets out to discover why some vegan products are more expensive than their meaty equivalents, Dr Helen Lawal asks if we should raise children as vegan, and Kate Quilton delves into the secret world of the vegan cheese melt.