If you want to choose the best diet for the planet go vegan.
A vegan diet which excludes all animal products saves an additional 0.5 tonnes CO2e per year.
There is no question that a plant based diet has the lowest climate impact.
Source: Dietary greenhouse gas emissions of meat-eaters, fish-eaters, vegetarians and vegans in the UK, Peter Scarborough et al, Oxford University 2014.
Photo courtesy of Sharyn Morrow.