Out of curiosity, how are you getting by on less than one roll a year?
Also out of curiosity, why, when ignorant on the issue, do you choose to side with the idea that "toilet paper is not causing a significant stress on the environment"? Is it sort of a "man is innocent until proven guilty" mentality? If everyone took that side when it came to The Earth VS Man, well, poor mother earth is going to get the short end of the stick a lot of the time.
Final question- you want "actual evidence" but will not accept research from conservation-minded organizations (i.e. conserveatree, world watch, greenpeace, etc.)... where would you accept evidence from? The toilet paper companies? Some completely unrelated, nonbiased, third party? And in that case, what motivation would they ever have to conduct such a study?