1) Have you actually demonstrated a real cycle, or are you just claiming one exists without any evidence or data? 2)The puny humans are taking millions of years of long-buried sequestered carbon, and releasing it into the atmosphere in the space of a couple hundred years, and that carbon happens to be such a powerful greenhouse gas that it can keep the planet dozens of degrees warmer despite being a trace gas in concentration. 3) No scientist claims that Humans are necessary for climate change. It’s not, either the humans control it, or they can’t affect it. Humans can drive a change if they pump enough of a powerful greenhouse gas into the atmosphere. The problem is, there aren’t any brakes on this car we know how to operate. We can start the avalanche, question is, how bad will it be. 4) They didn’t just take samples in one area. Why is it that people like you think that scientists somehow are so dumb or lacking in common sense that they don’t think of these rather easy questions? If you’ve thought of it, they’ve thought of it, and you might do yourself some good to study up and find out what they figured out. 5) Which brings me to solar irradiation. They’ve already looked at it, and the problem is, things kept kept getting warmer even when solar irradiation wasn’t following that trend. When the suspect is somewhere else, somebody else must be responsible. 6) That volcanic activity? First, it’s antarctic. Second, that geothermal activity has been going on there for tens of millions of years. It’s been there the whole time, and if it were the key to the melting, it would have already melted by now.