Perhaps it's time to restate our belief here at COTTonLINE: climates change, they have always done so, they will do so in the future with or without our help (mostly without). Tropical plants have grown in the near-Arctic and glaciers have extended halfway to the equator, that is how this planet operates quite independently of humans.
Humans are, at their worst, the equivalent of a minor skin rash on an elephant, perhaps an irritant to Gaia but not a danger. We pose a much greater danger to each other than we do to the planet.