The Hockey stick was aready debunked. There was a retraction made about that very 'hockey stick'. Problem was the data was evaluated by someone outside the click and the data had errors.
If you placed the length of recorded history on a football field, it would only take up three [3] inches, the whole field being the time our planet has been in existence. Let a half dozen of our largest volcanoes blow their top in a big way, and you might see climate change in a way that even Al Bore couldn't explain. Remember Indiana in the year 1815, the summer that wasn't!
There is no doubt in my mind that there is climate change. Just last July the temperature was in the upper 80s. Today it is in the lower thirties and snowing. See, climate change you can feel!