From the Royal Society of New Zealand. Not some blogger, but a group of real scientists.
Science, Climate Change and Integrity Science, Climate Change and Integrity News Royal Society of New Zealand
From a philosophical point of view, none of these lines of evidence “proves” the theory of AGW. However, by the same token, Joseph Lister did not “prove” that antiseptic surgery practices prevent sepsis; he only demonstrated that their use gave rise to vastly fewer deaths from post-surgery sepsis. The adoption of these practices came about not because a theory was “proved”, but because medical practitioners had the common sense to realize that he was very likely right. A more fundamental understanding of his ideas came about only when the microbial nature of disease was fully revealed.
This “precautionary principle” applies equally to climate change. Science has not “proved” beyond all reasonable doubt that human activities are changing the climate, but it has clearly shown that there are multiple lines of evidence all pointing in the same direction, and that this view is supported by theories that are well-founded in fundamental sciences like physics.