Do you realize that your chart doesn't actually show "the last ten years"? It stops in 2007. What's happened since 2007 is not irrelevant to the question at hand.
Here's an example of a temperature chart that does show "the last 10 years":
Hah! I also used to do crap fits to curves like that when my data didn't work. You can only fit a line to the graph like that if you assume temperatures are going to rise quickly in the future. This is a joke, right?
[1] http://www.climateinstitute.org.au/index.php?option=com_cont...