Here's a link to a deconstruction of the graph by John Christy that you posted (along with some analysis of his testimony to Congress):
Christy Once Again Misinforms Congress
The author of the Daily Mail article also has a less than stellar record:
David Rose destroys his credibility and the Daily Mail's with error-riddled climate science reporting | ThinkProgress
In other words, no - not much respect for the Daily Mail. I don't tend to rely on ANY news outlet for science information, for the simple reason that the people reporting on science for them tend not to have any scientific background themselves, and they often get it wrong. This goes for news outlets of all kinds, and even reporters with whom I agree. Often they'll even get more or less the correct conclusion for the wrong reasons.