As I've said before, I'm not a scientist and am not taking a side on the issue with this post, but what I will say unequivically is that humans over react with little thought to the greater picture. This leads to hasty judgements that are in many cases untrue. If you could plot a graph of the earth's temperature over it's entire history, I'm fairly certain it wouldn't be far from a straight line upwards but would look more like the Rocky Mountains.
For my friend I related this concept to personal life in a slight spin on my Swings and Roundabouts post. When my life feels shitty I try to step back and look at the greater picture - reexamine my past for context. I'm not the same person I was 3 months or 5 years ago. The data points of my life have been peaked and vallied but the over all conclusion is that I have moved significantly from the baseline. Yes it's swings and roundabouts but if you don't stop moving forward, it won't be a wash but forward progress instead. Dripping water doesn't erode a stone overnight. The progression is virtually indistinct unless you have various samples to compare to over time. If you feel like you are stuck or failing, step back, get out of your head and picture your life like a time line on a graph. Hopefully you will see it like a promising stock - trending upwards.