Fear-mongering or speculation?

I wonder: Does anyone ever mitigate these studies with studies on the evolution of plants, animals, ecosystems, what have you, in order to see if there are adaption rates? In other words: Isn't one of evolution's key points the survival of the fittest?

in reference to: Al Jazeera English - Europe - Global temperature 'to rise by 6C' (view on Google Sidewiki)