I can't assert why the climate is changing, but I assert that it appears to be. In addition to my clients, who research the climate for a living, and telling me they have documented change, I simply see the change myself! I have watched the weather as a GA pilot for more than 40 years, and the last two years have been noticeably different weather than from years prior. patterns I came to expect are no longer there. Patterns we were not used to, are more common, and repeating. Forecasters describing a "once in a hundred year weather event" for the second time in the same year, where we'd never had one in memory before that.
I see the change, and I read reports. As my work is responsible for some of the climate change measurement, when I see the results of the measurements, I know that they're true. Maybe this is just a very long period cycle in the weather, and not attributable to mankind, but so far, for all the pollution we throw into the atmosphere, I believe those who say climate change is at least in part due to mankind. I pay more attention to what I expel into the atmosphere than I did five years ago.
Do I think that mankind will succumb to climate change? I do not. But, I'm imaging a different world for my great grandkids, than I know from my lifetime. It may not be as nice. For those who live very close to sea level, I imagine them having to move. My work measures arctic and antarctic ocean ice thickness - and in the last 12 years I've been approving that research equipment in the airplanes, there has been measurable sea ice reduction - that's indicative of land ice pack reduction too, and sea level is going to increase. How much? Not mine to speculate. But some places I have visited cannot withstand much without a dramatic change to their society!
As I said to my charge, while I mentored her flying a 180HP PA-18, "enjoy this now, because when you're my age, burning gas like this to go 85 MPH will just not be tolerated by society!". So as we price out polluting, including light airplanes, what will the pilots of the future fly in to build their experience? The techies will build super simulators, and self flying planes, so our sim trained pilots just sit in the seat, in case the red light flashes, then try to apply skills they only ever learned in the sim, and hope that they don't really have to actually fly the plane to safety. So not only will my great grandkids live in a different world, but they'll travel in it differently too - probably not near as much as we do now, nor with so well trained and experienced pilots!