CO2 emissions per calorie (food)
I answered this question on SustainableLiving.SE. Since no one voted to close this as off-topic, I'll link and summarize my answer here. 

I'm glad you asked for it by calorie, since answers on that question had found the data by kilogram, which is not a particularly useful measure. The data source for carbon per kilogram is the Meat Eater's Guide from the Climate Working Group (I believe this is the same as the website you linked, as well); I did the kilogram to calorie calculations from nutritiondata.self.com which gets its numbers from the FDA.

You can read my entire answer, but I will copy the data table for your convenience. Units are kg carbon dioxide emitted per 1000 calories. 

Lamb         20.85
Beef         13.78
Turkey        5.83
Broccoli      5.71
Tuna          5.26
Salmon        5.15
Cheese        4.47
Pork          4.45
Yogurt        3.49
Chicken       3.37
Milk          3.17
Eggs          3.06
Rice          2.08
Potatoes      1.46
Beans         1.40
Tomato        1.39
Tofu          1.38
Lentils       0.78
Peanut Butter 0.42
Nuts          0.39