If you use these ingredients:
Long grain brown rice, one cup or so
Pinto beans, more than one but less than a whole bag
Black beans, maybe twice as many as pinto
Kidney beans, one third as many as the black but no more than half as many of the Pinto
Spices, at least three times as many as of different types of beans but only 1/100 of the mass of the total bean mass
Diced green chilis and tomatoes, one can
Given that the beans have been soaking overnight in filtered tap water, and that the rice is from place or places unknown, and that the chilis and tomato mixture is in a 14.5 oz can, and that Al Gore won a Noble Prize (shared), calculate the carbon footprint of the above meal. Be sure to include methane emissions in your summation.