The Last Frost

Although it's not perfectly accurate, there's a concept out there that helps to illustrate how a vegetarian diet can help save the world.  I'm not talking about health issues here because that's not the point of this blog. I'll also mention that I'm not a vegetarian myself, although I would love to be. My girlfriend on the other hand is, and maybe one day I'll join her among the ranks of the ultra efficient energy eaters. That being said, if I start to sound preachy I'm not trying to be, I'm just passing the hard truth onto you.

So here's my attempt at an explanation of the power of 10 rule:

Basically, the rule roughly estimates that as you climb the food chain, you only preserve 1/10th of the original energy input. The main energy source on our planet is the sun and some of the sun's energy goes towards growing plants. Some animals eat the plants and some animals eat other animals. The most efficient use of the solar energy, or energy in general, is to eat the sunlight, but hey that's what the plants do. The second most efficient option for us as walking talking creatures is to eat the plants.

Though when we eat the plants, we are unable to make use of 100% of the energy the plant absorbed itself. Some of that energy went towards the plant growing, reproducing, other biological processes, as well as heat emission. Plus our digestive systems are not 100% efficient, thus some of the energy is lost there as well. In the first stage, it is estimated that the plants only make use of 10% of the energy they absorb. Then when we eat the plants, we only make use of 1% of the original energy. Now let's say you get eaten by a crazed carnivorous animal, sucks for you. The creature who was so lucky to have had such a tasty vegetarian for dinner will only make use of .1% of the original energy input from the sun. The energy transfer starts at 100%, plants get 10%, vegetarians get 1%, and carnivores get a measly .1%. 

On and on it goes up the food chain of energy loss. So, let's now put it into a context that's really easy to understand. You can either eat 10 pounds of grain yourself, or you can feed that 10 pounds of grain to a vegetarian creature and net yourself about 1 pound of meat. Which do you think would feed the most people?

It's a grossly simplified analogy and again the math isn't 100% accurate, but the loss is real and significant, and it's good to be conscious of the energy footprint your next meal will have on the world. I won't even go into how many more people our planet could feed if we stopped feeding perfectly edible people food to animals just so we can harvest their meat.

What does this have to do with global warming? Check out part II of this article and I'll explain, I promise.

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This entry was posted on Wednesday, November 22nd, 2006 at 1:52 am and is filed under Activism, Agriculture, Climate Change, Conservation, Energy, Health, How-Tos, Pollution, Rants, Science. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.