...just had an applied ethics class and we discussed personhood for animals (per Singer) I used a link you posted awhile ago. part of my argument:
...We absolutely have a moral responsibility and obligation to our environment and all living things that we share our world with. Within that context we make very difficult decisions sometimes, including warring with other people (or any living thing or organism that could harm us without our provocation) killing to get nourishment and sometimes choosing one course of action over another knowing that the chosen act may possibly hurt someone in the process.
All this being said, as the question is presented to us for this argument; yes, I believe that animals have personhood. If not out of a sense of responsibility and kindness to the animals, then at least for our mere long term survival, we should not practice speciesism. We now have enough knowledge (both scientific and reasoning ability) to have a very real sense of eco-systems and how all living things in our world work together to make it function optimally. If we were to cut down all the trees in our world, we would suffer from their not utilizing carbon dioxide (A single mature tree can absorb carbon dioxide at a rate of 48 lbs /year and release enough oxygen back into the atmosphere to support 2 human beings
http://www.coloradotrees.org/benefits.htm ) and if we were to threatened honeybees and other insects to the point of almost extinction, then we would have to learn how to pollinate all of our plants (including our food and crops) by hand....
I have seen too many factory farms (both in person and on film) to not have a clear understanding of the abuse that animals suffer at the hands of their supposed caretakers.
http://www.earthlings.com/earthlings/video-full.phphttp://www.ecorazzi.com/wp-content/uploads/2009/12/paul_peta I understand the history of our diets and why we do what we do but I feel that it is time to seriously consider animals as our partners and not merely, as Descartes describes them, “…no better than biological robots…” I believe that there is still a place in our diets for meat but it must be on a lesser scale than what we consume and animals should be raised humanely and in keeping with sustainable agriculture. (Many studies have shown that “…the typical American diet adds significantly to pollution, water scarcity, land degradation and climate change and a recent authoritative report published by the World Watch institute… concluded that over 51% of greenhouse gases emissions come from Livestock”)
...Our textbook talks of the social contract theory as an “informal agreement among the members of our society and maintains that since animals cannot intentionally enter into this “contact” then we owe them nothing. I would rather call the social contract a system in which we enter into an agreement with each other to do what is in the best interests of the entire eco-system and all living things in it; in order that our children and grandchildren have an even better world than what we have at present....