That's a wonderful quote but a non-sequitur in this context, because it doesn't address climate change one way or the other.
You could have colder cold and heat, or warmer cold and heat. I mean, Murmansk Russia and Havana, Cuba both have "cold and heat, summer and winter" but it's a lot different in Murmansk than in Havana. Even during Ice Ages (which is most of our geologic history) there were, and will be, "cold and heat, summer and winter".
I myself (full disclosure) am an advocate of higher CO2--- quadruple it to 1600 ppm is my preference --- AND higher average temps (by a couple of degrees C), by the way, since it would have a hugely positive effect on the greening of the planet.
The Popes main job, imo, is to help fulfill Jesus' Great Commission of Matthew 28:19-20.
Given Genesis 8:22, let God deal with the climate as He always has.