The first one in particular is thought to be part of a natural cycle we are in, with CC unlikely to have effected it.
You complain about people jumping the gun and declaring it to be due to human activity without a carefull analysis, but then go ahead and jump the gun declaring it to be a part of a natural cicle.
I agree with most of what you said though. What worries me is that global warming (while most likely true) may turn out to be a huge distraction from more serious enviromental problems. In my opinion habitat destruction is the worst one of them.
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