@Rivergang, just a few thousand years ago, most of North America was glacier. Canada still is. Climate has changed and will again, there is nothing we humans can do about it. Yes, we may have an impact, but most scientists will admit this only contributes to 1.5-3C over the next 100 years. Millions of years ago, the earth was an actual greenhouse with average temperatures over 20C higher than today. We now call it the Cambrian explosion, when life exploded from a few microorganisms and shellfish into the ancestors of every species on earth.
It all depends on your time scale, humans need to adapt, there is nothing we can do now to reverse global warming, that time was 200 years ago, hurricanes are dying down and forests are exploding in growth, we control natural forest fires and they will become bigger and bigger each year. We need to prepare for change, not try to prevent it. Ask the aussies what happened when they tried to control nature, they got bunnies, lots of them, so they built a fence, so they have created entirely different ecosystems and even went to war with the emus (and lost), now they have rodents everywhere.