Its when there is a blind trust in the "scientific community" that things go south. A few hours with the available non-processed and non-"normalized" datasets is all that is needed to determine there is insufficient data to support the hypothesis that humans are affecting a change in mean global temps.
The earlier line of scientific thought that acknowledged the power of chaos (the butterfly that causes the tornado) was much saner. We really can’t know. Other than doing obviously bad things to the earth (like polluting it so much that we’re obviously wallowing in it to our own ill health) we can’t predict.