Thats because we ARE on a cooling trend, at least geologically speaking. Trouble is that recent decadal evidence suggests we are experiencing unprecedented (for the last 10,000 odd years) warming.
Thats what really worries me is that the real anthropogenic change is being masked by geological scale cooling so the actual human effect is far bigger than we realise.
Irrespective of cause, climate change, either warming or cooling, is really bad for humans, the whole of human civilisation has existed in a 10,000 year period of unusually stable climate, yet minor perturbations during this period have brought civilisations crashing down.
Its gonna be interesting to see what happens, but I think we are in for a hard time over the next 100 years.
EDIT: Without even checking the validity of the article, I was highly suspiccious of the close coupling between atmosphere and a single orgamism, that simply does not occur in natural systems, they are far too complex to be so simple. Too many feedbacks and interactions. Then when I actually read a bit of the methodolgy it was obvious it was a joke, sounded like an episode of Star Trek. \"I\'ll just depolorise the primary EPS manifold, then we can sublimate the tertiary plasma grid and centrifuge the DNS connectors and we should end up back at the point in time we left at\"