Eating for a Better Planet

If you want to, you can use the equivalent minutes of driving figures per portion (the numbers in the black circles) to order the foods in order of increasing emissions.

To find the emissions per calorie divide the grams of CO₂ emissions by the number of calories.  For example the calcuation for eggs would be:

$$\dfrac{470}{143}\approx 3.28 \text{ grams CO}_2 \text{ per kCal}$$