Sometimes more information can make us dumber.
Princeton Professor Michael Oppenheimer has done some interesting research on negative learning.
Uncertainties in scientific models such as the mechanisms of climate change can cause consensus to coalesce around wrong numerical results. This becomes a problem when policy decisions need to be made sooner than consensus can find the true value. There are a lot of reasons why this happens, but it's pretty new and interesting field of research.
(I just finished writing my essays for the Princeton STEP program.)