You are correct about the hog farms. Even though I pick up after my two big dogs, I am not convinced that is the major problem. What about urine from the alleys downtown when the bars close? We can not have life both ways. We can all work together to save the planet or we can all sink together. Forget what causes global warming! I do not care what causes it. What i do care is, "What we are going to do about it!" It is not my problem. I will be dead in a few years. Some of you will not be. How well do you swim? pick up after