Methodology behind the carbon footprint calculator - GoClimate Blog
Here's How to Calculate Your Carbon Footprint - Big Green Purse
Fighting climate change through food and drink: hospitality and brewing industries unite to cut carbon by launching new Carbon Calculator and Toolkit – Ethical Marketing News
Carbon Footprint • Cal Dining
Climate change food calculator: What's your diet's carbon footprint? - BBC News
Quiz: How Does Your Diet Contribute to Climate Change? - The New York Times