What is a neutral response to a question like "what is the impact of increasing taxes"? Do you think there is any authority that could be cited which isn't biased?
You do what Wikipedia does - present multiple sides to the problem as each of the sides views it, as accurately as possible. That's how you analyze _any_ subjective topic.
Wikipedia is anything but neutral on political topics. Their political bias comes straight from the top with corrupt administration and disproportionate application of their own rules and guidelines. I suggest you watch this interview with Wikipedia co-founder Larry Sanger on why you shouldn't trust Wikipedia. https://www.youtube.com/watch?v=l0P4Cf0UCwU
Doing that without bias implies to cite the entire corpus of every single public intervention on the subject. Any edit and summarization relies on trust and honesty to reduce bias — without eliminating it.
Wikipedia stabilize with editions being less and less frequent. This is not an unbiased system either.
Seems pretty easy, if there are a wide variety of differing opinions then cite the most accomplished author from each perspective and let the user figure it out.
Number of citations, book sales, number of links on the web, awards, use of their work in curricula? Probably a thousand other less obvious ways to determine this too.
The bible, Koran, and many other religious text are among the best selling and most read books in all of human history. Should their perspective be giving high weight when you ask how the earth formed?
