Or you know...science. I studied Environmental Studies at a Montana High School and a conservative catholic college in Montana, and even there, they acknowledge that climate change is a man-made phenomenon. If you look at the levels of carbon dioxide in the atmosphere over time, there is a dramatic spike that corresponds with the industrial revolution (this issue is being caused by much more than just automobiles). Correlation is not causation, of course, but when you look at the acceleration of temperature rise, sea-level change, ozone depletion, increased insulation factor of our atmosphere, oceanic temperature change, etc., the picture becomes pretty darn clear. We have dramatically altered the earth's carbon cycle, pulling billions of gallons of oil out of the earth's crust and releasing its waste products into the air (This incredible amount of potential energy would've remained just that for millions of years had we not dug it up). As a hunter, you have undoubtedly witnessed the intricate balance of earth's cycles. You should know how drastically we alter our environment when we interfere so greatly with these cycles. To be so self-assured of humanity's innocence does not mean you're a humanist, it means hubris has blinded you.
This is obviously something I'm passionate about and I hope that passion hasn't angered anyone. I'm not trying to start a fight or to get you to change your lifestyle. On the contrary, I think you should enjoy life however you see fit. We have passed the deadlines to cut carbon emissions. Our climate is going to change and short of making a drastic change in lifestyle across the entire world, we will not save ourselves nor even buy more time here. Earth, on the other hand, will be fine. New species will emerge, better equipped for a more severe climate, and I hope another sentient species develops to hunt them!
Sorry for the rant. Let's get back to what is important in life, getting lost in the woods.
P.S. It is not the fact that earth cools and warms over time that matters. Everybody knows about the hot-ass origins of earth as well as the last ice age. The issue is the rate at which the change is occurring. In a way, climate change is completely natural, we have just eroded the natural barriers to that change; our insulation is shrinking. So you are all right when you say this has happened before, it will happen again. The issue is that this change usually takes place on a geological timeframe, and we are seeing change on a human timeframe. Organic life cannot adapt fast enough to cope with the changes.